It took a few glance for me to work out it was a moon.
I like its strength. However perhaps think of the placement being bottom left or right of the shirt? Shoulder seems a little awkward. But thats just me.
it bugs me that the small skull is just a copy/paste/flip horizontal of the large one; to be part of a setting they should be lit from the same side. and a skull small enough to be a baby wouldn't look like that anyway.
About my design