Take some time and brush through some anatomy again. I don't particularly feel like putting my eight paragraphs of what you need to do with the anatomy here, so... internal structure, skeleton, muscle, proportion. The fun stuff.
I would suggest drawing out actual human faces too. Study from real ones, really look at the planes and structure of the face. Right now you've an anime-inspired head going on this character, which can have a tendency to flatten out any form that a person places otherwise onto a character's body.
As for the inking...
Well, the picture you linked, which you consider good inking, is interesting. I am trying to figure out the artist's intentions with how thick the lines are in certain areas. It leads the eye to believe that the hips and thighs are either THE focus of the piece or that they're closer to us than everything else, but then when it tapers down after the knee it's rather confusing.
Actually, a lot of the work is like that. While the lines are wonderfully smooth and connected, the dissolving feature seems largely misplaced.
So for basic inking, you could do a couple things.
In Photoshop: learn how to use the pen tool. Look up tutorials on dA for it, I could probably help given some other time of the day.
In Photoshop: Draw each line individually. Long strokes, applies pressure as well. If it's not good, undo and redo.
Easy PaintTool Sai: I prefer this for weighted lining. You can actually set it so that there's an intentional, smooth lag between where your mouse was and is, so making the perfect line is actually so much easier in the case of having only a mouse or a small-ass tablet.
Will go into further detail if requested.
I am quite ignorant on vectors, as is, so cannot tell you how your linked artist can do what he/she does.
Bah, I apologize, this particular post is a bit under par.