Not going to say much because it's 2am and I should be asleep x_x.
I think if you applied the rule of thirds this could've been a super good tag, it's in the middle so the background is broken up on both sides so the atmosphere lacks a bit, it seems like you made an awesome background too so it wouldn't be hard to have built off of what you currently have background wise (I'm sure it won't happen due to adjustment layers and whatnot, but keep it in mind for future projects). I love the lighting, depth, flow would've been better if it was rotated 90 degrees so it's going with the way the render is instead of perpendicular to it. Your lighting is especially good in this, I really like how you darkened the edges a lot too. Maybe don't leave the exposure with such a bright gray next time, it's a bit too bright and takes away just a bit from the contrast. Your colours compliment each other very well and you did a good job placing the colours throughout the tag properly, well done. The text is bad but I'm not good enough at text to give you any tips on it. Don't put the fractal over the border noob x___x lol.