I'm lovin' the creativity even though cartoon isn't my type. Your backgrounds are always matching by color and theme and I like it a lot.
But I think you could add more, such as a fade out border on the sides, fading out with color and transparency. and perhaps cutdown on the full background. Or something, that would just be my take.
Also, I see your screenshots are bad. Make your own server so you can change server variables and start it with a map that has textures that add contrast to your spray. Then put in sv_cheats 1, cl_drawhud 0, jpeg_quality 100, give weapon_scout. Afterwards use the scope of the scout and you will have a 100% clean screen of just the map and the spray and the quality of the screenshot will be maxed out (assuming you jump up your video settings). Because it's no fun at all having shitty screens for good work! Keep it up ;D