I just love how you use pictures of people that I recognize and change them so much that I can't even recognize them anymore. YamaPi for Kenshin, Hayato Ichihara as Naruto, Junno for L (!), Horikita Maki as Soi Fong... I could just go on. Every time I find the pictures you reference, I always have a big shock.
RK being a favorite anime of mine, I just had to leave comments. The expression you created, sort of leaves a loophole to me. I followed the anime and OVAs closely, so seeing him in his red hued clothing; I expect a more gentle side from him. The expression has me feeling like it was spawned from the T&B OVA, just as his conflict begins with Tomoe. Thus it feels like you captured him somewhere inbetween it all. Peculiar, and original. Secondly, while the blood effect is just that - A show of his talent was that every kill left him without another's blood (with the exclusion of a few understandable circumstances in the anime/ovas). Lastly, the hair would be the most excellent part of this image. It does capture his hairstyle to the very fullest; through contrast, length, and...poofiness.
Seriously, your stuff is brilliant. They always look so realistic! Anyway, I love his expression, it looks very calm yet with a hidden desire to kill. His dark eyes look so cool :3 Though, doesn't Kenshin have purple eyes? No biggie, though XD The scar looks very cool, too, and I love how you do the hair! All the different streaks of colors looks so awesome, and you have a lot of patience to do this entire pic<3 Also, the red translucent pattern is awesome, too, it adds a neat effect. Amazing job!