This is airbrushed, or hand painted? If this is a result with airbrushing, I'd say your spray pattern is way too tight.Hea guys, I'm new as well and thought this would be a good place to ask. What ratio do you mix the paint. I have been doing 1:1 (paint + thinner) but I tend to get brush strokes on my armor. . .
If you have a way to adjust the pattern, open it up more and make slower passes over the armor. You'll probably need to do multiple coats until the finish evens out.
If it's hand painted, this is a good example of why a lot of people like airbrushes for covering larger areas. It's really hard to avoid brushstrokes on a larger surface.
As far as paint mixing, it really depends on the type of paint. I test my mix ratios until I get good even flow thru the nozzle.