It's kind of a fad on deviantArt and tumblr I believe.

Nice.

But imo it would be better if you didn't apply such a rude animation

 Devils are supposed to be sexier! It's like... An erotic fantasy law!

Fun indeed. Why does the evil one have bigger breasts?

 Haa just you wait and see my friend! Half of it's already complete, just the demon to go >:D.

 Oh ho ho ho, I'm severely hoping you can deliver. I'll be eagerly awaiting an upgraded version.

 Nah it's fine haha. I'll tell you what you got me fired up so i'll take your challange seriously, there is no real reason I shouldn't be putting more effort into these anyway. I'll whip a new version up by the end of the day :)

 Oh yea, it came off completely arrogent. 

But I should apologize, I based your abilities as a pixel artist on this one picture. Sorry.

ugh that probably sounded really arrogent. I'm saying your not wrong in this specific work, but this work doesn't really reflect my skills as I mean, I was just having fun. 

eeeh i'm just trying to unwind with these, I can try if you want? tempted to prove you wrong ;p

 I have to say, you're an excellent artist. Your pixel art skills, however, could use quite a bit of work.