I'm using Dulks inverse kinematics for the arms, but it doesn't seem to work very well with the legs. Ideally this character would have legs that are similar to her arms. I've tried just shortening and lengthening a line similar to the arms, but it's not giving me great results. Suggestions for shading? Shadows? Any help would be greatly appreciated.
You might try splitting the leg into two pieces, upper and lower, with anchor points in the appropriate places (hip for upper leg, knee for lower leg). Make them 3d and parent lower leg to upper, and upper to the body. Then actually rotate the pieces of the leg in z-space. This will result in "real" perspective/scaling of the leg pieces as they move. If your material settings are enabled to react to a scene light, your shading will also happen automatically.