I am currently developing a game and was trying to figure out art style and I am getting really confused. I am not a designer but a developer and going to be using some designers to help. 

I was looking at some of the paid tile art and was going to use them sparingly and keep to a certain style but I was told my characters don't line up with the style of art. Attached is a copy of the tile art and a copy of one of my characters. Can anyone explain why they dont match, and what I would need to do to make them match?

Does my character not have enough detail? Can anyone point me to a tile art asset that may be a better style than this one? Not that I am going to pay or use it but I need something to understand and explain to the designers.