The car doesn't seem to fit into the sig. How can i make it look better?

trash it and follow a tut

Basic : Use photo filter and smudge your car (Make a copy of the layer, smudge, then put that copie under the original layer

Basic 2 : Make multiple copy of the render, move them around so the background is filled up, right click on those layer, mixed them together, use guassian blur and some other stuff, you should get a sig that's kinda blend

remove car