Well, I don't have a "fitness" picture, or a current one really, but you can see me at:
http://www.picturetrail.com/thrashej
I am not as tall as you or as lean as you. I also am 26 and have never had any kids. I am only 5'1 on a good day and weigh 137 pounds at 25% body fat, maybe a tad less. It is in my New Year Resolution to try and decrease that percentage a bit. They make it look so easy in the fitness magazines, but when you got a job where you sit on your fat %$#! all day, it gets kinda hard even if you are working out 1-2 hours per day. There are many days I wish I still had an active job!!
You have got really nice arm definition. I would say I have the mass there, but I just can't see it all as much as I would like.
Creatine has made a good difference for me...I think I have put on some muscle since starting taking it. Like you, I do have "enough" mass, but I am kinda the type of girl that could never have enough, you know?? Muscle is good!!!
I will try to get a fitness pic of me at some point. I think that it is cool to see everyone, even the ones that don't look "picture perfect" because atleast then you know that there are other people like you out there trying to get skinnier!!!
Take Care and keep up the good work,
Janice