>>4 if its already popular why would you want to use it?? a reader may see it and think your story is unoriginal. most stories on wattpad that share the same cover with different titles are usually the same story with different names anyhow.
and if you want someone to draw one for you ask in the art section or make it a contest on a social media website like facebook tumblr or G+ and tell the winner that their prize is something simple and either low priced or free (like a shoutout, or you will follow them)
btw you just reminded me that i havnt used wattpad in years almost