You've got concept nailed down, mate. Only problem is the execution.
Godly lighting. No complaints here except the swirly lighting on that sword-thing that feels totally wrong to the dark feel of the tag. Same goes with text. :( And colors are washed D:
Quite like this one too. Better without text, without the swirl effects, and without those stars at the background. :P Colors are a problem here too, but I think it would look okay without the reddish touch to it. Lighting is great here.
All in all, you need to work hard with colors. I have to admit you're pretty good at monotonous work (people rarely do because of how dull mono tags can be), but working with a larger color palette will make you better, so practice. xD Text needs some work too (one tip is to never associate the text with the flow or movement of the render, it looks bad, but you have pretty good text in the Prince Of Persia tag). And also, no random effects (stars at the background :P). But you're pretty good, so good job! There is always room for improvement. ;)