No offense, but I don't think this sig is that good. To me, it just looks like a low-quality sig and as you said, you just got back into making graphics, it's definitely shows in this sig. Try and do what 7Goat said and make your backgrounds have more stuff in them like stock pics or C4D's. Also, you said the color was blue but I'm not seeing the blue, it might have a little tinge of blue but it's mostly a black and white background. Try and play around with colors, use the hue and saturation or a gradient map. If you need more ideas, check out some tuts at deadly or something and I'm sure a lot of the stuff will come back to you eventually, just keep working at it.