Background art and tile map help?

Im working on a fighting game with newgrounds characters(Pico, hank, tankman, and the knight from castle crashers.) But I cant seem to make a good tilemap or background art. I will keep trying but if you would like tp help the stages are: School(pico), Military base(Tankman), The weird red place with floating rocks(Hank), And Barbarian war(Knight). Its a side scrolling game.

that place is where you fight mega tiky

Yeah mega tricky. I already finished making that place as it was the easiest one

I believe it is called (PLEASE DONT BAN ME FOR THIS IDK HOW IT WORKS) Regular Hell. Thats what Krinkles said on a newgrounds post