I think a vivid color door would make your house look modern. A light blue door would matches with the color of your house and would be very beautiful to look at.

I really think it would give your home a brighter look..fresh and crisp..I think it would be a great change just the trim painted....I would consider doing that before painting the front door.

I’d look at Farrow & Ball, Dulux, and Edward Bulmer colors. Do searches for them with ’front doors’ and lots of images come up. Dulux Indigo Shade: Farrow & Ball Green Smoke is versatile: Farrow & Ball Lichen: Farrow & Ball Mouse’s Back. I know, it’s taupe, but what a good-looking one: F&B Card Room Green:

Just looking at your home again, Nina. It's really cute and while I agree with others that you could make a larger impact painting the whole house, I also realize that's not always in the budget. In the meantime, I'd take a que from Beverly's rendering and leave everything as is except I'd paint the portion above the door white to match the door and garage. The light fixture above the mailbox looks a little small so you could add something a little bigger and contemporary. You could install it a little more to the right to help balance the space since the door is off centered in that strip of siding. I'm not sure what your bushes are but I'd try to trim up the one to the left of the front door and probably replace the one to the right with something a little smaller. Small boxwoods below that front bottom window would look very nice. Edge out your beds and add some mulch, power wash your front stoop and sidewalk and it will give you a fresh look for your home. Whatever you end up doing I hope you enjoy it.