Hey there! What you have isn't too shabby. Here is an edit I've done to help show what you could do. (hopefully this looks alright. My monitor is a bit screwy with colors)
What I did
1. The most important thing I did was change the hue for the shadows.
2. Shifted your colors around so they have more contrast (greater difference between the colors.) Low contrast being less difference.
3. Changed her pose so she has more balance. I'm not sure if that was a good choice. Maybe you have her posing like that so it matches the clothes. I don't know if they have been made yet. Likewise that is the reason I didn't change her foot.
4. I attempted to shade her in the same sort of style you have going on. Wasn't able to finish though.
Anyway hope this helps somehow.
Also I liked the pose you had before. That pose is more interesting. I can see why your client wanted a pose like this though. Now the characters are able to hold objects and you can see the clothing better from the front.