Text is still a problem by the looks of it.
As for the first one, I don't like the bland background, and the blue bit doesn't work with the BG at all, but does look nice with the render.
The second one is nicer, but again the black/grey background doesn't work with the rest of the sig. Try putting some more colour in those areas.
Now for some good comments

I love the effects you've added to the second one, work really well with the render you've used. These sigs are quite nice, but can be improved upon.