Original:

WIP 1:

Plans:
Matte white base color with camo flauge vinyl like this
Maybe with exactely those colors. But I'm not sure yet.

Please help me with this paint..

Looks good so far, but what do you wanna help with ' with the paint?

The biggest problem I have no idea how to make the front arches. I mean the lightness..

That part..

It'll probably be a lot easier if your brush the whole car that green and then select and change parts to the white and grey. That way you don't have to brush each separate piece of camo.

or you can brush all car and then go and search military pattern ,and use it from blending option

Sounds well thanks
Patterns are for pussies :3

Here's another tip for the camo in case you don't want to use a pattern. Brush the different hues in the camo in solid colors like red, green and blue. When they are solid colors and each color on their separate layers, it's easier to change thm later with the Hue adjustment tool.

So if I brush the color parts like green in red at first it will be easier? I don't get the point of how will be easier to brush it.

Not easier to brush it but easier to change the colors afterwards. If you brush it like the Audi reference it's going to be difficult to change the color of white, grey or black later.