I think what you did is beautiful the colors and the quilting is great!!
How much quilting is too much depends on how you look at the finished product. If it is too stiff or too flat for your taste, then do a little less quilting. Some items I do are quilted densely and some that I want soft and drapey I quilt less densely. I go for a certain look and feel -- when I get to that point I stop.