Hahah, looks gnarly!

The background does not match with the fore ground in style, the spear and victim are drawn with semi-perfect lines and vibrant colors, while the background is mostly a dull purple with sloppily drawn lines. Hope that this helped you out :)

Hmm… Well to give you helpful criticism I'll start off by saying that the color purple you've chosen collides and distracts from the beautiful colors of the character, blood, and spear in your piece.

Assuming it's digital, I would take the color back to 30% opacity or use these color codes if you can; ad6dab or a469a9. If neither one of those works just keep messing around with the vibrance and opacity of the color purple until you get a cool color to compliment the warm colors in everything else. A good thing to do is squint while doing this so that way you can find out what works and what doesn't. ^u^

Don't mean to sound like a teacher. >///< Either way it's a pretty sweet composition! I hope this helps a little!