Grats! You jumped in pretty deep with the
OSL straight away, they came out well too! The different colours/chapters was a good way to practice to see how the different colours go with the pre shading. When getting a red for my Blood Ravens, I did 15 models with different shades and combinations of red to get it just right... so hard to choose hahah.
Are you enjoying it? I love using the airbrush, regardless of how effective it is for painting. Did you enjoy how much faster and easier it was to get a good basecoat compared to a brush? Basecoating with a brush = zzzz. Basecoating with an airbrush = hell yeah! ; )
Now that you have an airbrush, you'll definitely want to look into part assembling before painting. I know you said these were test models, but it bears mentioning - it'll make it much easier to get good highlights and coverage.
I'd highly recommend the following youtube channels if you're interested in tutorials to improve your skill with the airbrush:
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Buypainted - my favourite, enough so that I paid to subscribe to his videos on his own site, but he has heaps of good videos on youtube still.
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Awesomepaintjob / Les Bursley - Damn talented bloke.
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Wargamers Consortium - Bunch of guys (including Les
iirc) with a great range of videos.
Sorry if you knew any of this, but couldn't hurt to mention it ; )