arhh, I don't think its right basically copying the reference image, I'd personally try something completely different and try interpret what you've learnt into making it better.. But I suppose you're still in the basic learning stages, whatever gets ya goin

. check out the reference's shoulders compared to you'res, you dont have em. And the chest area is too sparse, looks shrivveled. Also, try not to mirror too much, just to get the structure balanced, otherwise you'll start pillowshading and everything will look unnatural.