The hi-res doesn't look that bad, just keep at it and dig around for the best reference shots you can find http://www.3d.sk/?id=3
usually has the goods.
The low poly one could use a bit of work, watch your edgeflow on areas around the joints, the more work you put into it now, the easier it will be when you come to rigging. Ben Mathis has some nice character modelling tutorials...http://www.poopinmymouth.com/tutorial/tutorial.htm
You could probably lose a few polys here and there too. Normal maps work better over simpler models. As long as you keep a nice sillouette, don't feel you have to use loads of polygons, just because you can