If you have the pictures, you can have them printed on fabric or you can do it yourself. I'm not sure I would take the old pictures out. I might applique them over the old ones, perhaps a 1/4" larger and use a decorative stitch to attach. This might make it a bit more secure than cutting the old one out and inserting new. If you can remove the old batting and replace it with a thinner (maybe even a warm and natural) batting, it might make it a bit sturdier. I'm just throwing out ideas as they poop into my head with the common base of this quilt getting heavy use and probably washed often. I'm sure whatever you come up with, it will be appreciated.