This is a pretty good try at making a sig. However, I feel that the whole signature just does not flow, you have so many effects piled on top of eachother that it looks a bit muddled up. At least you've got a pretty decent quality render in there. May I ask what program you used?
While none of your elements are bad by themselves other than your text, they are randomly slapped together with no aesthetic sense. First I suggest picking colours that match each other and getting a colour scheme going. If you have a stock or render, it is best to base your colour scheme on the colours in it, if any. Next, you need to decide on a focal point. A focal point is a place in your piece that the eye gravitates to; it is the center of gravity of your art piece. Yours is the word 'SORA', and the sig has no flow beyond that. Nothing around the word complements it. When you have a focal point, you should try to design your work so that the eye automatically goes to that point when it glances over it. A good thing to try when making any piece of art is to make sure that all of your individual additions have their own layers, and to turn the visibility of them on and off, gauging which additions add to the overall aesthetic and which ones take away. Keep the ones that add to it and take out the ones that take away, and you should be doing better already. Keep trying.
I very much agree with Makaze here. There is one thing I'd like to add though, and that is the blending of the render. Instead of just smudging(?) or pull the render layer underneath your top render layer, try a couple of blending layers, smudge underneath or on top, but keep the opacity/layer properties to overlay or soft light. In my sigs, I usually have at least 4-5 layers of the render alone, to make it blend better with the background.
Focusing on just the head of a stock isn't the greatest of ideas. Try picking a stock which has some movement so that you can create some sort of flow. Also don't just pile up effects underneath your main stock. Try creating some layers which help blend your stock into what's around it. Good Luck.
Be warned, I don't really have much experience with graphic art. xD It's not a bad sig, but I feel like there's a lot going on, and it doesn't really flow, yaknowhutimean? The effect around Sora bugs me in particular; it makes it look like the picture of him was poorly cut out. Like I said, it isn't bad, but it needs a bit of work. :3
I really like this, you should make more. I like the calm blue colour that seems to match nicely with the image of Sora you've got there. Not such a fan of the brown colour, i think it upsets the balance a little, but it's still pretty good.
That render is amazing quality :o ! I like the placement of the render, and that blue colour on the left side. But the effects, the text and heart, and the brown on the right are extremely distracting. The heart, text and effects, are kind of "in your face"; they are really bold, which can be distracting at times. As Makaze said, pick a focal point, and then use other details to bring attention that focal point, not to a different spot. Try to play down those elements using a lower opacity or a different mode. The brown doesn't really contribute to the flow of the piece, but that's easier to fix. Just use a different colour and you're good (: . Good luck! I can't wait to see your future works .