You have a good sense of form! The face is the best part. As far as constructive criticism, there's two things that can help you clean things up a bit:

1) More control over pencil pressure: your lines are fairly dark, and I can see a few points (the feet, mostly) where the paper is pushed in from them. It can make it tough to correct a mistake, as we can see with his right foot where the impression of the previous sketch still shows up. Making lighter lines with less pressure for the initial skeleton and then erasing them after everything else is finished makes the final product look much cleaner.

2) More confident lines: with each line you've drawn, you seem to retrace it several times. This is a very common thing when just starting out (I still struggle with it), and it can sometimes make it hard to discern details. For example, is the very dark region on the underside of both metatarsals supposed to be a very thick outline, or a pawpad similar to the ones on the phalanges? The ideal is that when you put down one line, it should be exactly where you want it. This video might help: https://www.youtube.com/watch?v=WJkkpN7TZt0

Overall, this sketch definitely gets the idea across; the large parts are where they should be and overlap in a believable fashion. Your next sketch can be even more appealing with a little cleanup.

Thank you for the feedback! I went back and cleaned up the sketch a little. I agree, I do need to work on all that.

I haven't spoken to Em in years. Whatever he does is none of my concern. Not sure why you found it prudent to unearth this very old sketch to tell me this, though. If Em's politics troubles you so much, just cut ties and put it out of your mind. Donald supporters aren't worth our time.