That's a darling house! And a beautiful flowering tree. I think it would look great with a different colored front door: pale aqua/blue, yellow, maybe sage green. And since you can see the lining of the drapes from outside, I think it would be fun to line them in something that faces out toward the front yard, in a broad white and color-of-the-door stripe, if that doesn't show through or compete with the front of the drapes. I'd keep the box above the door white; with a colorful front door I don't think you'll notice it.

Your house is adorable. Test a few colors out with sample pots on poster board to see which one you like. I think sage green could look lovely. You can post them here for opinions. A few large container plantings of annuals in the summer will give you long lasting color. Keep the permanent plantings simple unless you are a gardener and don’t mind the extra maintainable, pruning, trimming, deadheading and dividing perennials, mulching, etc. Try posting on the Landscape Design forum for some planting ideas.