I don't like the text on any of them. Download some new fonts and play with the blending options and opacity.
First one's background is good, but the random BeatSlicer picture thingy on the left in it is just random and doesn't go with it at all.
Second one looks like a bunch of girls on a background made out of colored pencils. Lol, the colored lines are just thrown in and do not blend at all.
Third one COULD have been alright, but the render(s) do not blend with the background, closest you got was the dark colors in the render matching the black in the background.
Fourth is actually good, but whatever is on top of the Render(blurred render it looks like), should have had a opacity change or a blending mode to make it not so eye catching, make it blend. And the blue behind the render and the blur could go with it, but I wouldn't have used blue if it were me.
@ All of them: The text is just there, just put on top and not blended, very plain.
A lot of the colors clash in each one.
If you're just starting, or have not had much experience, the fourth one is a great start, and you should continue like that.
Make a sig following a tutorial then remake it later just add some of your own style too.
Just my 2 cents.