Obviously there are many more details to be added, but I think this is at a point where a WIP thread might be appropriate.
The current pose is just the default until I get the character rigged.
Comments & crits are welcome.
That’s very good! I really like the looks of things thus far. Her features are pleasant and it’s all well-modeled. Personally I think her hands and feet should be a lot larger. Make sure you check reference as to how large they should be in proportion to the body.
I personally would also lengthen her shirt a little so her stomach is not showing, and maybe make her clothing a bit less form-fitting. I prefer modesty on my characters, especially female ones. There are enough lust problems in the world without the ever-increasing realism of 3D characters adding to it. Wrinkles on the clothing (using normal mapping, maybe) would also be pretty nice.
Also make sure you’re using a blending colorband on the hair to make it “fade out”. It looks like you might be using strand settings that are a bit wide at their bases. Thinner hair is incrementally more realistic, as is more of it. Obviously, you want to save render time though.
Did she dye her hair? I’ve never quite seen that shade in real life.
The bicycle tires are awesome! The textures look great! And the spokes are very symmetrical! I think the bike’s modeling is quite superb.
Are you going for a cartoony, smooth look, realistic, or somewhere in between?
At this point I think I’m going for something in between.
Here are the shoes I came up with tonight that will go on the character:
As Ataru pointed out, the hands and feet are small. The shoes look great.
The shirt sleeves look awkward, most girls either wear shirts with no sleeves at all, like tank tops, or shirts with slightly longer sleeves, at least over the deltoids. I haven’t seen many sleeves ending in the armpit, and it looks uncomfortable.
Are you going to give her a helmet?
Wow. I love the shoes. Sweet progress!
Yeah, something in between is my personal favorite look. 
Gotta agree with the sleeve critique too, I didn’t notice that before.
That looks uncomfortable, lucky she isn’t a guy.
Good modelling though. The shoe looks great.
wow i like your style, it looks all very clean and colorfull, like in the times of the good old games but with much better graphics of course !
the shoe is also great, i´d like to see the wire not solely because its such a selden and cool idea of creating a funny sports shoe
her hair looks odd
nice texture on the wheels
that all screams for animation
Thanks for the comments!
Here is a closeup of the tire. That’s actually a “texture”, just modeled with array and curve modifiers.
And here is the shoe with some wires:
Here is the reference pic I used for the shoe:
ah ok, some parts on the wheel surface just looked like a texture.
the shoe doesn´t have much vertices but you don´t see that on the close up, good topo
btw: her shorts could need a bit more specular, that kind of material reflects very much imho
Great details on the wheel.