Hugo, I’m not sure what you are trying to achieve here? It looks like you did a “Salt Technique” that resulted in those random chips? Why is thew floor yellow when the rest of the vehicle is gray? That doesn’t really make sense.
First, let me advise you: BE BOLD. Don’t be afraid to take chances–you have to dare to push your boundaries.
If you want to start getting a good interior, spray the interior a dark gray. Next, mix about 20% white into your dark gray and spray the top and middle of your panels in the interior with this lighter color. Imagine that your air brush stream of paint is the actual sunlight, creeping into your interior. Highlight the inside of your panels, and leave the original darker shade close to the seams and where shadows would fall. Next, give all of it a thin wash of gray oil paint–just combine white and black until you get what you want. This will tone down the contrast.
Do the same thing on the outside–use the principles of light and darkness to imagine where to paint dark gray vs light gray. Filters of blue or brown can then be added to subtly tint the overall hue of the base coat. You can also add a brown filter/wash in the lower hull interior to simulate dirt tracked in by crew’s shoes.
Read my blog here to understand the concept of “Light and Dark” Painting technique. I did it pretty radically here in this thread–but you don’t have to be stark with it. But read and learn how to control a paint finish: [:)] click here–Ersatz Panther Build Log