i am having a blast with this stuff. i asked what it might be called in another post and a nice member said it might be "layering". i searched and found that layering was stacking separate thin, mostly 1/8" layers of wood following a pattern then adding the picture/drawing to the layers then gluing the layers together.
this "3D cover?" is a comic book cover glued to 1/2" plywood, planning and cutting the cover into "puzzle pieces?" then using the layers of the plywood to adjust depth and hot glue each piece back into the body of the cover. very few of the pieces go back in "straight and level". for example all of the arms in this cover are made flush with the body of the subject and farther out at the hands to create more depth.
in any case i love doing it and have been lucky enough to sell a few to help pay for stuff to make more.
the last picture is a jig i made to hold the body of the project to make reassembly much easier.