I do not know why you would max your [E] Before your [W]. IF you max your W then you get lifesteal up the ***, and will survive the early game quarrels. Not just that but E doesn't even do much damage TBH. If you can give me an explanation I would love to see it.

I disagree with the Warmog's comment that Cake made. I'm not generally a fan of the item, but I do feel that it's rather good on Lee. I do definitely agree that you need more Magic Resistance in the core build, however. I'm not entirely sure where it would fit in, however. But a Force of Nature, Quick Silver Sash, or ideally RuneGorger (assuming they actually release the item at some point), would solve the MR issues. I would agree with getting the Trinity Force earlier if you were lane Lee Sin, but I feel this purchase is too costly to rush in the jungle, unless you're fed on kills. Slows and Sheen procs hardly matter if you can be bursted down before doing any real damage.
I'd also recommend getting flat armor Seals, as they really help out with early game, all around --jungle safety, ganks, etc etc--. Glyphs... I'd probably go for Magic Resist per level... just because they're really strong.
I really like the masteries. They provide a super strong early game. I'd probably personally run 0/21/9 masteries, but only because I really like Juggernaut.
Good guide overall! I'd like to see some expansion to the items section. Perhaps some situational purchases (eg if they have a fiddlesticks, you buy a QSS), but I like the simple, straight forward layout. Quite easy to read.

Warmogs are horrible on lee sin. It doesn't matter if it scales with atma's. The runes make up for it. Also, trinity should be gotten much earlier than late, late game. They give you much needed stats and the slow and sheen help out alot. Also, you should try putting on more Magic Def. A burst AP like Annie could disintegrate Lee Sin, regardless of how much hp you put.