The first thing that I would do is put a nice sharp edge on the bed along the grass side. A good edge makes a bed look neat and carefully planned. Next, I would seriously think about edging the whole bed with a low hedge. It's a box - play that up. As the hedge grows and fills in it also covers/hides/detracts attention from a lot of problems. Since height is the basic issue, I would use a perennial that can be sheared, something like Santolina, Teucrium, Germander, Iberis (Candytuft), or Aurinia (Basket of Gold). I have had good luck in my zone 5 garden with Santolina (only marginally hardy for me) on the outside edges of raised beds with the corners done in Candytuft and Aurinia. If your garden conditions are right, short sedums might be an inexpensive edging/hedging choice, since almost any stem would root for you and shearing would not be necessary. You could check out ones like the blue/grey Sedum sieboldii (6-12in), reddish Vera Jamison (1 foot, but sometimes flops open), or the warm yellow variegated Sedum alboroseum Mediovariegatum (listed as a 2 footer, but only growing about a foot in my clay, forms a nice rounded upright plant for me). There are lots of taller sedums, but my Autumn Joys and the newer Maestro (a sport of Matrona) get really tall in good garden soil. Also, it's just a guess, but I think that a shorter edge will make the other plants look taller than they are, somewhat hiding your height restriction problem. This sedum idea really depends on how much you like sedum and how much sedum you like. You might try mixing and matching some of the shearing plants up with some sedums at your local nursery and see if you get a combo you like, then using the sedums in shorter runs or for structural impact in certain areas. I would stick with just a few types of edging plants to make the area more unified. If you wanted to, expecially since it's a large area, you could also divide the inside of your garden into sections or shapes. Lots of Parterre ideas are available online and in books. Remember though, that even relatively informal hedges, such as I have suggested, are WORK. You could start with a perennial hedge on just the grass side towards the center and see if you like the effect, before spending a lot of time, effort and money on the idea. You can then divide or take cuttings from you existing plants and spread them across and down the sides over several seasons. Also you could easily incorporate the Dianthus that you mentioned into this garden. They are nice low plants that like good drainage. I am especially fond of the Chedder Pinks like Firewitch which form dense mats of bluish foliage. There are lots of other varieties, but the matting forms (versus the grassy ones) also plays into that guess/idea of mine that you need layers. A caution though - keep the Dianthus away from your grass - I have a really bad infestation of grass in some of mine along my grass path, which I just can't seem to eliminate. In fact I would keep your entire edging/hedging planting at least a foot away from the grass edge and keep that area heavily mulched. Some of the sedum groundcover ones such as Dragon's Blood or Angelina are pretty short( 4-6 inches), very colorful in bloom, and spread easily. They could be used to carpet the interior of the bed, lessening the too much mulch look. Another possibility are Thymes. I'm especially fond of wooly thyme, a very low blue-green mat forming thyme. This can take some moderate amount of stepping on which might be nice along a driveway. Lots of other steppables out there in the marketplace, even one using the term as a brandname. When I want to plant a larger-growing new plant in my garden I do not hesitate to simply dig a somewhat larger than usual hole (to give the new plant some breathing room)in the middle of my thyme or tear out a bunch of Dragon's Blood sedum and plant directly into these groundcovers. The removed bits can be patted into the ground somewhere else and usually take well with no extra care. A good edge and some strategically placed pots of creepers might give your garden a finished look and play well with your hot color scheme.

Congratulations on your new house and have fun decorating. I believe bringing pops of color to the rooms will help a lot. A colorful throw, vibrant pillows, etc. will go a long way in warming up the area. Not sure I would have the couch hugging the wall and any rug in the room should have the furniture legs setting on it. I would definitely move any chair closer to the couch so the person sitting in it doesn't feel so isolated. We love scandanavian/mid-century furniture but it might be done to death? Who cares, if you love it then do it. I think everyone should decorate with pieces they love, not what is on trend at the moment.

What a lovely front porch! I'd be so tempted to hang an old-fashioned porch swing. What I really want to say, though, is that I LOVE your yard sign. Thank you for displaying that, and for sharing it with us here. We need to see more of that sort of radical welcome these days. :-)

Once upon a time we lived in SoCal, and twenty years later I still miss our garden there. If you do containers, you will want to plan to Irrigate them before you build the deck! Will a deck be more or less expensive than a concrete patio? Because critters sometimes live under decks! It’s so hard to find mature trees in SoCal, I would try really hard to prevent what you have, get them pruned by someone, not the mow and blow guys!