It looks pretty good. You didn't provide the percentages which are important. You do have some overlap, which isn't necessarily bad. You've got a shot of mid-cap in there, which I personally like. Same with international, but don't go too heavy on that. A shot of small cap wouldn't be a bad idea.
At your age, I wouldn't bother with bonds or emerging markets. Keep in mind portfolio construction is rabbit hole, you can make it as complex as you want. You won't know which construction is the winner until far in the future, so I don't think it is worth agonizing about too much. When in doubt, simple is your friend. Main thing is start young (which you are), keep the fees down (which you are) and contribute as much you can. Do that, and you'll have a ton of money in the future.