Strangely, I can't really think of any celebrities or well-known people I'd aspire to look like, although in contrast I find some individuals in my life, just every day sorts, incredibly attractive and would kill to look like them.
I could stand to have a cuter face, one that's more proportionate and more defined. Height-wise, 5'9 or taller would work fine for me, and a slight build would be nice. I definitely wouldn't mind looking like Jensen Ackles, or Zayn Malik, just to throw a couple options out there.