You didn't post a back shot, but I might recommend building up a nice wide lat & upper back and when you start gettign tight, to whittle down your waist. Your legs have great shape. You should have no problem getting to the striations, etc. I dont' know how easily you build your legs, but it looks like they mass easily (I'm guessing) so make sure your lower body doesn't overpower your uppper body.
I have attached a back pic to give you a better idea...please point out all weaknesses. Your input is important to me!
Thanks!