Are you wanting to do an acrylic gel transfer of the images onto the wood blocks? If so I would recommend having some scraps to get the technique down with first.
When you do the acrylic transfers you make a laser jet print on plain copy paper. Don't forget to reverse the image. Then you put the acrylic gel medium (the stuff you use in acrylic painting) on your wood and stick the printed side of the paper down.After it dries you wet the paper and gently rub it off. This is the tricky part because you don't want to rub the ink layer off. The resulting image will not be perfect, but that's kind of the point with a transfer method like this.
Another method is to simply coat the paper with the gel on the image side then after it's dry carefully rub the layers of paper off .This method is more difficult because you have to be careful not to tear the gel layer. But you can then wrap the image around things, like a block.
I've tried it with ink jet and it does not work nearly as well as with a laser jet. I've also tried Mod Podge as many tutorials suggest and the results are much better with acrylic gel medium. I have seen people have success with blender pens (you put the image to the wood then color with the pen on the back) but I don't like the way the image sinks into the wood with them.
If you're just printing then gluing the photos in the blocks and are worried about smudging just apply some fixative before you mod podge the images down.