Get the dust off your model! Or whatever that stuff is. Less harsh lighting would be a good thing too, so we can see what is your highlights and what is actual light. Make sure to neatly remove all mold lines from the model, and if possible seal any gaps e.g. in the shoulderpad and between the two parts of his backpack with putty. Drybrushing metal is okay, but not the best. Your gun would look better with another colour: you could do the big curvy part yellow or something (any colour you like, and you could also/instead colour the main 'body' part of it... as it is it's just a bit boring). Oh, it's a work in progress... I can't tell how much you were planning to highlight that armour then! Finish it and we'll talk.
So given everything that you have pointed out that is wrong with this mini, why have you given it a 7??? I'm afraid this is tabletop quality and no more.