No! Don't stop! You make such pretty//beautiful things! Anyway, I kinda..dislike how dark this is? But that may just be my personal opinion. The opacity in gradient textures just bother's me. [If you did use gradient textures //Kelly is a derp] I like the placement and such on. Jealous of your pieces.
I personally like the piece even though I have to agree with Korosu about the darkness of the image. It is dark but all and all I like the image. Keep it up.
Great work on all but two things. Because you have one very bright spot and a ton of dark space, the tag looks mostly empty. You should add some content to the left side. The text is a little too sharp. You should lower its opacity slightly and let it blend with the background a bit. It stands out even more than Sora does. You have good grasp of what colors go well together and render blending, so don't worry about changing that too much.
This is a great start for something wonderful, and by your previous works, I can tell that you do wonderful stuff. I wouldn't give up on this one just yet, I'm sure you can do something more with it. At a first glance, I can see what you're trying to represent - Sora is light in darkness, yep. Unfortunately, I think there may be too much darkness in this one, as the left side of it looks almost completely empty, save a few texture spots, which by the way look nice. I'd say that maybe you might consider moving Sora to the left a little, just a bit - don't put him in the center, but off-center-right, that might do some good, and then after, use some complementing lighter colors to spread around Sora, give the light just a little of a farther reach. I'd also take a look at not having it so sharp as well, it seems to have a hard effect on the eyes (and mine being especially sensitive, I mostly say this for myself), and maybe darken the overall image just a little. It's a good start, maybe with some of those tips, you'll gain a bit of inspiration with this piece; good luck!