I like them.

But let's get the CnC rolling.
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#1- This is probably the second best one. I like the render you used but you should have made the render more blurry to blend in with the style and colors you used. If it was meant to stand out then you have made the style around it too odd. Also on the top of his head on the left side, the are white spaces between his hair and the brush part. Put more brush there. Mess around with that. Also the the text is way too bright; make it a little softer. Also the bottom of that air sig is blurry and top is sharp which doesn't work with air sigs. I suggest making all of it blurry. Also the bottom part is messy. Clean that up.
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#2- Probably worse than the other two. I like the test you used but the text, render, and colors all don't fit together. Make the pink parts of the whole sig a little softer and darker, because they stand out more than the render to me. The render was good but a bad pick to use bright colors with. Also you made the hair and whole render purplish, make that go away and make it a lighter color so the render can stand out. If you keep this render, then definitely clean up parts around the render so that it can stand out, and remove the color from the render so it doesn't sink in with the sig colors. Also you have splattered way too much with this one, clean it up.
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#3- Definitely the best air sig in there or sig I have seen of yours. I love the text, and the colors + style are good, but what I see is just a little picture with colorful smoke around it. Make the render bigger, so his fur coat can be outside the smoke. That would look better.
Overall, I love the work. Good job and Keep working. ^_^