One thing that immediately jumps out to me is the inconsistency in the poly density over different parts of the model. For example, there are very obvious polygons in the arms and hands, but there are also a lot of wasted loops that don't seem to be doing much from the waist down. Also, and this might not be applicable…
praetus- The model in the high poly didn't have any pants on at this stage because I hadn't worked on the new pants yet. Funnily enough my lecturer used to say the exact same things. ;) Thanks for your feedback and i'll definitely try to improve on it this time round. ChrisPerr- You have no idea what your comment means to…