He looks like a Male version of the statue of liberty...
His Neck is very long, his left arm looks disjointed from his body, at the top, his right hand is a little too Fat... His hair behind the band should curve to the left of him not the right from the angle of his head...
I am just a picky bugger... Ignore me if you like, but I think your picture needs some work... But this can all be changed once its coloured and gone over with a fine liner, I often do sketches like yours then correct small pencil drawn errors at the end, like in pencil stage I draw the hands with the fingures conjoined and change them in the final stage when I know the look of the face etc...
The actual style of him looks good, I like the armour and attention to detail... He looks like a Knight and no normal knight at that... he looks special like a Royal or some thing, Don't get me wrong I see a lot of pertential in your work...
The Hardest part is to get the Air around a drawing right rather than the image... And your Air (Style of dress etc) Is fantastic... Get your self an action figure like a Gi-Joe (the ones with all the joints) Position it and use it as reference for your drawings, it helps... Its just the Basic Skeleton that needs work...