Well, I didnt really like the first three to be honest, the borders ruin the sig, there is to many renders and and to much of an obvious stock picture, you should blend it more like you did with the first one, but you couls still se the stock
And also, I like the idea with the Death Note sig, but actually seeing it totally transparent that you can see the first layer is not good :3, And you faded Light pretty badly (You just erased some of the parts right?) There is another way to fade him more properly,
The Ichigo one has to many renders, and the border thingy is not that appealing, I barely see the background, but from the looks of it, it would have looked much better if the style was simpler but the work was better
The two below rock asses :3