Even though this is a second model, there is no excuse
Really go back and examine how each shape looks, dont miss stuff out or do a shape 'The easy way' just because you are new, a lot of it comes down to devotion, really spend your time, and dont be surprised if your doing say the receiver for a full day, at least it will look right.
Go back and work on these most major issues:
Sights, they should be right at the back, with that amount of distance your not going to be very accurate.
The stock, all it is right now is a box really, research how it folds to the side, round it where necessary.
Grip, The grip is made up of a lower and upper half, and is much more shaped then what you have now, use the link i sent to you a few days ago for reference.
The receiver is off too, the top half scales in, not to mention the fire selector, ejector etc.
Dont take all of that too hard, but with the right mindframe you can be chugging out quality models in no time.