Don't forget to take out the background if you're using the Supes one. Will stand out more. The first monkey you posted was good, though I'd flip it so it's looking into the post rather than the outside.
I'm at work now, but I have one at home that's a monkey in a hawaiian print shirt playing an electric guitar that's pretty good.
And I know my avatar is looking off the page, but I couldn't alter an Alex Ross print just for better eye flow on the screen.