Those are pretty good, for first starting out. You have a ways to go, they are pretty basic, but still really good :)

Thanks to TRUeLM, Plastictree, Scrax, Xiaowiriamu, foggy12, JahGFX, jhoijhoi, msrobinson, JEFFY40HANDS, Nyoike, MissMaw, and me :) for the sigs!
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I'll show the original Image along with what I first created/rendered, and my new sigs I made today. Let me know what you think! :D
Original Images
First sig's created (Ever)
Newest Creation (Requesting feedback for)