I think you did a wonderful job on the feathering and stippling - the
back looks great!!!
It's really hard to like a quilt if you don't like the colors.
I tried to live with a triple Irish Chain bedspread that I did in pink and green, . I finally had to put it in the closet and will use it as a blanket because the color combination is so distasteful to me.
Your sister will probably love it - because she chose the colors!
.