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The most outstanding anatomical issue is how short you've made his thigh.
Also, you need to stress tension of pulling that cart. His front foot needs to be more planted. Right now it looks more like he's posing.

Especially at that angle, his thigh should be longer.
And what I mean about the foot is that it looks like it is just barely touching the ground, like he isn't putting weight on that foot.

I think my teachers would have laughed me out of the room if I refused to use reference. Then they would have slashed my grade for the class.

Remember that the thigh bone is longer than the shin bone. You have the ratios reversed in this drawing.

For knees... look at some reference man. I swear to god. You HAVE to.
Look at your OWN knee. Look at how the tendons attach to the knee cap. Try and capture that.

The knee looks fine.
Seriously.
Professional artists use reference.
The people who don't have truly mastered their craft because they've been doing it so long.

If you refuse to use reference, you'd better be prepared to get s**t for it. That's all I'm sayin'.

Of course, I'm not saying I have never used reference images before, or that I'm against the idea. Everything we know has come from a previous observation, so sure! All I'm saying is, for me, a hobbyist, drawing is more about the process than about the final product. I enjoy trying to figure out what to do while drawing. A kind of challenge that I do for myself is that, whenever I start drawing something, I don't look at refs until I'm done. No matter how awful it will be, the mistakes I make remain as lessons for next time. The anatomy and ref images, I only use those when I'm not drawing to stack up knowledge about the figure. Just like now, you have told me that the thigh bone is longer than the shin bone. It goes straight into the record and it will help me notice that the next time I look at an image.

In this drawing, I did not even draw a stick figure. I was trying to see how familiar I am with figures as I have not drawn anything in way too long, and there seems to be a little space of time coming for me that will probably allow me to draw again. It seems like I have been observing torsos too much.

@reapersun, of course I agree to all you're saying, but with all due respect, that would be a different image. And yes, he is content. His daughter's fine, what else does he need?

@Tohomito, amen to what you're saying. I shouldn't have changed the foot. e_e

This piece lacks emotional impact. I look at it and nothing is implied to me.