Spidermans: The Rhino

Here's a 1-2 hour concept of the rhino.  Spiderman has the best villains(better than batman).  So why not?

Blue Gremlin

Here's an hour painting. 

Dragon

It would almost be impossible to fight a dragon.  This little guy has arrows cause, what else can you do?  Seriously you would need a balista and an army to bring a dragon down, but I guess he wants to be a hero.  This is a Gold dragon?  I don't know, just made it up.