If the driveway and sidewalks have yet to be installed and you have control over what materials and shape are installed, then you have a great opportunity to enhance curb appeal. Consider the shape of your driveway and how to make it interesting. It will be wide because of the 2-car garage so some type of brick edging or brick lines will break up the expanse. Also consider concrete or pavers to stay with a masonry theme.

Actual window boxes that work well would probably be custom made, which might be more than you want to spend on a house you're selling. You might slap some decent ones together yourself since it's a fairly simple operation to build an "open box." The key to good window boxes is making them large enough to hold enough soil to actually grow plants that aren't panting for water on an hourly basis. To make them look good, hang them somewhat below the window so that what grows in them doesn't screen the window itself. Include pendulous plants so that much of the window box itself is covered by foliage and/or flowers and works to obscure some of the blank space below the windows. If you want shrubs below the windows, you might consider regular Nandina for a look that is not too "tight." (Your photo does not allow us to see the ground space in that vicinity.) I like the portico being white much better than the dark green. For shutters and window boxes you might explore one of the many variations of TAUPE, a color that goes almost anywhere with almost any thing. Trying some paint samples will be more productive than discussing color theory for hours or days.

I like the porch proposed above. It does give dimension to the flat fascade and makes a good way to transition from the brick to siding. If you don't add a porch I would suggest painting the brick and the siding the same color to unify the entire composition. The proposed front door looks great. Not quite as sure about the stepping stone path across the front of the porch but do very much like the side walk from the new steps. You could also consider either adding a window on the second floor (if the interior arrangement allows) or changing the size of one or more of the existing windows to give some variety. Good luck!

briggs whitaker, I do commercial electrical work for a living and many of my fellow coworkers have gotten solar installed. Depending on your state, at least here in NJ, many residential solar installers are offering new roofs, new electrical services and clearing of solar obstructions like trees. My one coworker had 20 trees removed and a new 200amp service done at no charge after they quoted him the system. I'm not saying cutting down mature trees for solar panels is a smart move or the right move. I'm just saying if it was ever a possibility or you liked the idea and wanted to investigate then now would be the time before having work done. You may be surprised what could be done at no charge as many solar companies are getting subsidies to get solar on roofs at any cost. It's not for everyone, not every house or site benefits from a grid tied solar system. I also find it's better long term to invest in one more high end item vs doing several smaller cheaper or compromised projects. Say for example the front door. You might use that door daily instead of someone who parks in the garage and uses the interior door. Investing in a higher end door gives you better build quality, better finish, better feel and better air sealing and or thermal performance. Then hiring a good contractor with good references and local examples of their work, who has a great attention to detail may be better than trying to do a stock door from a box store and using one of their installation contractors. It might not be large overall sweeping change you are looking for but long term doing something like that once a year will get you there. Same goes for roofing. Try doing a little research to see what makes a good roof installation. I'm not saying you need to necessarily learn how to do it yourself but knowing that the use of higher end underlayment products (tar paper vs some of the new synthetic wrb's to a full peel and stick membrane vs a liquid applied product), basic understanding of flashing, proper valley treatments or proper roof ventilation (ridge vents and eave vents) etc or as simple as knowing basic fastening requirements (architectural asphalt shingles get nailed on the manufacturer marked nail line). We waited on a short sale years ago that we had to walk away from because during inspection our contractor friend and I got on the roof and discovered the all the shingles were nailed incorrectly and the counter flashing was installed backwards. I spoke with the neighbor and they informed us the previous owner did it themselves. The bank didn't want to move on price so we had to walk away. Long story short is, just because someone gets paid to do something doesn't necessarily mean they are good or the best. Sometimes knowing some basics of the job you are hiring for can present you red flags of a potential hire during an estimate. I always suggest to buy good materials but more importantly hire someone who installs the materials correctly. It doesn't matter how expensive something is if it's installed wrong. Ymmv.