I've made a portrait quilt from a photo and am now having some problems.

I fused the face and sewed round the elements then fused it to some pale fabric so the background doesn't show through. I sprayed it with 505 and placed it on the background. Then quilted the background but didn't quilt the face as it would have caused ridges. I'm really pleased with the result but the face is now starting to pucker. I think the 505 has lost it's grip, I've ironed it from the back but it's not made any difference.

Any tips please

This is my quilt it's just 10.5"