Holy crap.. that sketch is awesome!!
I can see why not seeing the faces would be an issue for some people, but you don't HAVE to see their faces.. the fluidity of both characters is insane!
Between Hulk's fists hammering down on Thor with that cement, and Thor's Mjolnir about to.. uh... "fist down"
...literally smack Hulk silly.. wow.. great piece overall.
I'd treasure that sucker, you lucky s.o.b., Ratchet.