It really depends what he is modelling.
But in general its never a good idea to start off with a box and just keep subdividing into it. You'll end up with a huge poly mesh. You should be chopping, cutting into it. Adding polys and mending areas. Beveling, smooth shifting the little areas etc.
It looks great fraser. Some renders of objects wouldnt go a miss. I'd like to see them rendered out instead of the screen grabs. This way we can see your true potential of texturing. Cant really tell from the modeler shots.
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