well....this was a real experiment for me...just had the idea but didnt really know how to do it. But, i took of the old clothing and then put on a layer of clear varnish. and then the picture and then a nother layer of varnish. Really easy but it takes some time for it to dry. And you should have a place that are big and airy, and not like me, in my bedroom. The smell from the varnish is not the best....if your not looking for to get high.
Hope you try it out
Cheers
Edvin