What Are Little Boys Made Of?

So...my last post was the first part of the poem...What Are Little Girls Made Of, so it only made sense to do the second half next. I had fun planning this one. I couldn't find anything to paint from life that seemed creative enough, so I gathered photographic references of critters, and a pic of my beautiful boy...I like the result. Black ballpoint with colored pencil accents. I can't decide whether to put more color in, or leave it as is. What do you all think?
PS: this looks way better big, so make sure to click:)