Wow, I can really see the effort you've put into this, great job!

Here are a few tips to make it the scene more effective, I hope you don't see this as harsh criticism. I realized you've vectored a scene from a manga page and basically coloured it. You took out the shadowing on the bottom right and left to change the lighting, a very good choice. However, doing that should also change the shadowing in the garage. The manga basically focuses on the car, but your wallpaper focuses on two subjects. Uh... what I mean to say is that your car's shadow is a bit too heavy. If you wanted to stress on the idea of 'friendship', adding some old parts or etc. in the background could have made the scene more nostalgic.

In any case, it's a great effort!

On a side note, have you tried adding textures to your walls? I took a brief look at your gallery and thought that adding textures might give your wallpapers some more spice. If you know what I mean...

Ooh yay, an Initial D wallpaper. :) I think you did awesome! Going from the b/w scan to this~ Wow. I especially love how you vectored/painted the hachi-roku. *__* Looks almost real! I just have some minor problems with Takumi's shirt...and, well, him overall. ^^; I guess I just think he pops out too much from the wall, and the shading looks off. He looks more "cartoony" compared to the realistic looking 86. But everything is really awesome! :3 You worked very hard, and cause I love Initial D so much, I'm faving~ Great job! Just work on the shading a bit. :)