Ok first up I built this from a bag of assorted CCBS parts I got second hand for a fiver. It was a little self set challenge to see if I could build anything from what I got.
Here's what I turned it into.
A bag of CCBS parts? I'm pretty sure I see a Piraka foot in there... Either way, this actually looks pretty cool, if a bit basic. Nice parts usage on the legs and the weapon in particular. Those shooter pieces don't make the most convincing horns, though; I would've used the pieces you have on the weapon for the horns. Still, given the limits of what you were working with I'd say "well done."
Looks like you could've rebuilt Splitface with those parts
The moc is pretty neato I guess. Why does he have horns sprouting out from his armpits?
well there's a good reason for that.
I don't know it though, my reason was "just put some spines on its shoulder blades"
Looks like something out of MTG.