Hello I plan on making a animation but I am bit confused on how to merge 2D and 3D well. I am going for the 2.5 D effect where the background is 3D and realistic while the character is 2D hand drawn. What do I do to make the scene realistic. Here are two my composited work, one where I tried my best to hide the lineart and make it less visble, while the other is making it very visible.

Image 1 Trying to Hide Lineart

Image 2 Exagerate the lineart

I saw Klaus which did 2D and made it look 3D but how do I get rid of the black lineart so it looks part of the scene.