Cute!
Most orchids sold in stores are fairly young (first time blooming), but it's also quite likely that your Phal will stay on the small size. It will likely get bigger than it is now, but not become large.
It could be one of those "smallish" Phals, as I like to think of them as. They're too large to fit the miniature criteria, but they're not that particular big either. Personally, I like these smallish Phals, and I have a couple of them (doesn't sound like much, but then most of my energy goes to my 45 Paphs...)
I just realized I said the same thing as WhiteRabbit, except I wrote a novel about it.
I agree with WhiteRabbit and TheMutant. Cute little flower. I have a fist full of these smallish Phals and I love them so much more than the bigger ones. Don't know why.