5 views no comments.. I hate seeing that kinda stuff.
For the first sig I think you can make the render stick out a little more by not blending the sides too much, and maybe blend the whole thing as a whole just a tad bit, and blend the text too. The BG and render match pretty nicely. Good job.
The second sig, I think you really needed to blend that render in. I think that would give more of a feeling of.. an angel or whatever those things are, but give that some transparancy. The BG on this is good too so I think you really should consider blending. Maybe make the chick glowing and the text match that too or something. It just looks like a piece that was released before adding the final touches to it.