It's was pitched and became a cover of a magazine, that's why it was so high. I try not to work outside of the 300 resolution frame because of just how long it takes to color. Typically, I stick to 72 unless specified otherwise.
Deviant Art is filled to the brim with great ideas and concepts. I think that's the only thing to beat all the negative bits out there and there's plenty of yuck out there.
That reminds me back in college, we had this giant bag of googly eyes in our art department. One of us had a bag of pistachios in their car. We stuck the googly eyes all over the pistachios and it looked like a tiny Kermit The Frog army.