So here are some suggestions...
Although the windows look like they have been replaced at some point, they are tired and need some detail and sparkle. There seems to be a little bit of depth missing, as well. Adding the appropriate millwork/moulding around and between the windows would help with depth and adding muntins would help with detail. White or ivory trim with black windows would help add a fine detail and some sparkle. New windows might be the best, but it could be done with millwork add-ons. I wouldn't add shutters to this house. They really aren't needed, and could look incorrect for this Craftsman style of house.
A grander entryway would look appropriate on this house, even if you don't use it as such. The entryway that you have now seems to not quite match the scale of the rest of the house. A door with a window and sidelites would fit the bill. This way you could center the opening. Even though the stairs are off to one side, this could still feel right. While you're at it, a larger carriage light centered in the ceiling of the porch would make the porch more inviting.
The porch/portico would benefit from a grander railing up top. This could be wood or a polyurethane millwork (polyurethane is more expensive, but would be much less maintenance, and if painted, looks just like wood).
Centering a double french door above the porch could give greater access or just add more light to that upstairs hallway. Again, it just fits the scale of the house better, and also just feels more deliberate.
The entrance to the right side looks like it could also benefit from some more architectural detail. French doors and sidelites with muntins would look architecturally correct to the house and add that needed detail. It would also add continuity with the french door above the porch.
Landscaping could be much more lush and green. Curved lines could soften the strong lines of this Craftsman Foursquare. The piers on the porch could be topped with large urn planters and a seasonal mix of plantings to top it all off. A paver sidewalk heading straight toward your door would feel more inviting.
I know some of these things are larger ticket items than what you are asking for, but they would go a long way in helping with the curb appeal of this already beautiful house.
Here is what it might look like...
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Chairs
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