well, they are both of not much work. sorry to say that but I kind of can see what you have gone through to make them. see here, the renders you used are not blended well and are too small.
the text is not bad either, but you could have made it smaller that would have looked better.
I like the background it is so nice and well done but the sig needs a border as well, and I have just noticed that the tiger's tail is out of the canvas.
and the corners one is rounded and the other three are sharp.
it is not a bad sig, but it needs work on it