Yeah, a bit too dark... I like the texture for the floor and walls but i dislike the color chosen for it. The shadowing in the back of Sasuke looks messy, and the color choice for the shading seems too dark. Keep practicing!
Notice it's a bit different from my others (usually clean Vektor/Vexel), but therefore the style is quite uncomplicated and fast. Lots of blurs and many layers with "multiply" were used. The background was rudimentarily done (sorry for that ^^), just wanted to see some reactions, how people like this.
However, next week I'll probably color a smaller panel (look like in Shipuuden) ifI find the time
Interesting choice of colors, I wouldn't make the shading so heavy for Sasuke or any other character next time. I like how you have given the rocks green moss, not usually something seen in colorings of this fight.