Some suggestions...
1. The biggest change to push it into a more Mid-Century Modern space would be to change the front left bump out to more of a front-facing gable instead of a hip roof. Adding in bigger windows and transoms that reach all the way to the eaves would beautify this house inside and out.
2. The front entry is hidden. It needs to be defined and made special/more inviting. First of all, I'd change the door too a more MCM-style door, and paint it a bright aqua/teal. From the left side of your new gabled front, add a covered entryway. On the left side of the covered entryway, add in a wall made of wooden vertical slats or louvers to define the area. Run the sidewalk up to the door.
3. Add aluminum windows with black trim to give the windows some punch. New windows would give you the opportunity to change the window style to a more MCM-friendly, updated modern look.
4. Replace the driveway with pavers and move it away from the house a few feet in the process. Moving it away will help the house breath a little bit with more green space snuggled up to the house.
5. Landscape! Frame the window areas with taller plants, like grasses, small ornamental trees or larger bushes. All of this softens the brick and adds color to your cool-looking house!
It could look like this...
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