Great quilt!
I'm not great with picking out complementary fabrics for a quilt, either. Part of it is color-blindness, although I can see the basic 8 colors, but all the in between shades baffle me. The other part of picking fabrics that is difficult for me is how to put different prints that are in the right color set together.
What works well for me is to limit myself to 3 or 4 fabrics, use one as a focus and let the other 3 fabrics enhance it. I absolutely love 2 fabric quilts! Your quilt looks like it si 3 fabrics, so I would have been very comfortable making it!
I also don't use super busy fabrics very often.
Bottom line is that eventually you will find out what works for you and that will solve the picking fabric problem.
Meantime, ask for help at the Local Quilt Shops or buy pre-cuts.
I wish you many years of happy quilting!