Could i suggest that perhaps in the future you resize your images to between 400 - 800 pixels wide before posting them up this will allow people to view the piece as a whole and make it easier to give you comments on the work oh and since you can imbed them in the post like this (600 pixels wide) makes it easier as well!

Right now for a few comments, the sword on his back is either really short for such a large handle or you forgot to add it coming out the other side

The ear is perhaps a little high and maybe a touch small.

The colouring looks alright but you appear not to have a constant light source so some shadows and highlights are in the wrong places. I'm guessing that it was coloured on a PC or Mac in something like Photoshop. I would suggest neatening up the lines a bit before you start colouring, this will give a better overall finish to your images. Bomu has a tutorial on the main organic metal website which covers one way in which this can be done. Personally i tend to redraw my pics completely in Illustrator to get nice smooth lines this of course is not really required but i like the nice smooth lines this achieves before i start colouring a piece.

Perhaps a few more details in the hair would also make a differance rather than solid black this will make it look more dynamic and like hair

Hopefully this helps some i'm sure you will get more comments from the others shortly.

Edit - Or due to my slow speed before me!
Cloud - great minds think alike!

Oh and i just noticed the hand holding the sword his fingers should be lower than the handle at the moment they are coming through the handle! (hope that made sense)