Where do you live, in general? Do you get lots of snow? I would remove the overhang for sure. I would also remove the carport if possible, or perhaps reposition it to the left, although I can't see what is there past the left of your picture-looks like the concrete pad extends to the side which is where I would put the carport. If you do ask yardvaark (he does have terrific ideas), he will request a view from further out in order to see that part of the yard. If you can move the carport, then you could add a porch across the front of your home, although just adding landscaping across the front would be great.

I like your ideas. I think a medium charcoal gray or weathered wood roof would look nice. I wonder if you could set the addition back about two feet with a square bump out in the middle. The roof line could be lower than the main house. Inside, it could be a vaulted ceiling. Clad it in clapboards or flat panels with trim; see the section next to the garage below. This is an example of the setback and the center bay, although not the same style as you house. Of course no Gambrel roof.

In all candor, at first glance I thought your house was stucco rather than cedar because on my screen, it appeared to be all one smooth color. Your wood has both angles and straight vertical boards in the center but they are not obvious until the original picture was enlarged. Consider "breaking it up" with a feature or texture -- something other than colors -- wood that is that is left natural stained cedar wood. You might consider some of these options; a wider and more elaborate "frame" around each window's existing black framing. a cedar "cornice" above each window cedar "wainscoting" below each window if adding above and below each window, perhaps have the features connected by a pair of vertical cedar boards, doubling the width of the window frame, adding cedar to the black framing the vertical side corners of the tower with cedar boards, with or without horizontal cedar boards at the ceiling level for each floor. cedar shutters for each window pressed metal art -- preferably something already painted for exterior use and/or that you could repaint as needed with exterior Rust Reformer and RustO'leum 2x spray paint. https://www.etsy.com/listing/734363932/arbor-metal-wall-decor-metal-wall-art?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=metal+tree+wall+art&ref=sr_gallery-1-4&pro=1&frs=1 https://www.etsy.com/listing/235476302/outdoor-metal-wall-art-natural-steel?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=outdoor+metal+wall+art&ref=sr_gallery-1-15&cns=1 https://www.pinterest.com/pin/378865387387076086/ https://www.overstock.ca/Home-Garden/Handmade-24-Inch-Painted-Tree-of-Life-Metal-Wall-Art-Haiti/10566143/product.html?refccid=4A73M7RTN4U3CQCMVYN2CZK3PU&searchidx=17&kwds=&rfmt= https://www.etsy.com/listing/103103020/sun-metal-wall-art-choose-your-size-36?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=outdoor+metal+wall+art&ref=sr_gallery-1-28&frs=1&col=1

I think I would want a couch with low square arms that are equal to the height of new end tables. Low arms make it easier to stretch out on if used for napping and easier to reach drinks on an end table. I have a leather couch and a fabric covered love seat. The love seat is much more cozy, the leather is stiff. I got the leather because we could use it to take a break from working outside (dirt on clothes - mud on shoes). I would go with neutral colors and add texture and color with pillows, throws or fabric covered foot stool. Are you considering shades? I think Roman ones could look good. Also think about how many cushions for couch - one, two or three. I wish I had gone with two instead of three for the couch and one for the love seat. The plus side of more cushions is that you can move them around if one side of the couch is used more than the other. Also do you want to be able to remove the back cushions or do you want them attached. Do you want to be able to flip the cushions on the seat - I can do it with my fabric couch but not with the leather. Some stores have a basic model with customization - cushion firmness etc. Ethan Allen has some models you can customize. Also think about VOC's - Pottery Barn has certified furniture for those concerns.