I would change the background fabric to a smaller print ( if it's not too late). I think the large print in that block throws things off. It is the only block with a large print.
I never use fray check on appliqués unless it's a wall hanging that won't be used or laundered. Fray check makes a very stiff hard edge, very difficult to sew through. You could use decorative threads to highlight features on the shoes which would add definition to the blocks. It's going to be a very sweet quilt.
