That's a really nice and solid first tattoo! Excellent placement as well. And no, nothing odd about it at all; nothing odd about only being tattooed on your legs, and nothing odd about having only a single tattoo on your leg either. So, there's no need to rush into getting more coverage on your legs as fast as possible, if that's a concern for you. It'll no doubt look great with some more traditional pieces to accompany it, but it looks killer by itself as well.
Regarding the designs you posted, I like the first one the best. It has a cool and solid silhouette, which I think is somewhat messed up by the three added roses. My best advice though, would be to find a tattooer whose stuff you really like, provide a few pointers on what you like and what you don't like i.e. "pilot girl, not too much floral stuff" - and then let him/her do their thing.
That's what works for me at least. Either way, it looks like you're off to a great start!
By the way, who did your tiger tattoo?