I feel like I could use some advice on foreshortening.

Robert,

I'd recommend doing a few in-depth studies on the bones and muscles of the knees and elbows. Your connection points look 'mushy,' like you don't know what is happening beneath the skin's surface. This mushiness is causing your images to lose depth. 

Try Human Anatomy for Art students by Fripp and Thompson or Goldfinger's Anatomy for Artists. These should be in your local library, and while you are there, go to the biology section. There are usually books written for students learning to become doctors and nurses. They often have great references in the books for you to use as studies. Some libraries will have real skeletons for you to draw, which can be a very valuable resource for any artist. 

I hope this was helpful.

All the best,

JCML Fine Art

For feedback solely on foreshortening, I would take another look at your legs. His right leg (left to us) is closer to the viewer unless he is supposed to be doing some cross legged pose, which it doesnt seem like. If his right leg is closer, it needs to be bigger, and the foot needs to appear farther down than the left, especially since it appears more straight. It is much smaller in the image, making him heel lopsided, because our brain is telling us "Hey, his left leg is supposed to be farther, why is it bigger and longer?" 

That being said, I really like your torso, and it feels well connected to the shoulders and feels dimensional!