I like your mentality on these spitpaints; the more you do, the easier it gets. I'm not really sure what the exact correlation is between effort and difficulty, but I'm very sure that the higher the effort is the lower the difficulty will become... eventually. Those armor studies are absolutely beautiful, seriously. Whatever you're doing, it looks like you're keeping up pretty well with your understanding of construction and form. Your ability to create cool ideas will strengthen as you do the spitpaints, but it would be cool to see you try some more compelling compositions. You seem to have a pretty good handle on rendering and painting, given enough time- now throwing some intense composition under that would be awesome.