Your MiG-15 there looks to be suffering from too thick a mix, though it's hard to tell exactly because of the photo quality. I say it's too thick because of the little chunks of paint I see down the side of the fuselage and the buildup on the side of the starboard wing's air fence.
Try thinning it up a bit and pulling away from the model a bit. Finally, are you airbrushing in even passes across the model, or are you spot-shooting?
Orange peel is the opposite, it's an occurence of little depressions among otherwise level paint. Go have Earl Scheib paint your car up some day and you'll get my drift.