Thanks for the suggestions, Gum!

Like you suggested, I think it's mostly his front half that is the issue, so I'll do my best to make the corrections when I get around to working on this again.

Can I give a few tips?

Starting from the front end, his neck needs to be a *little* longer (Clydesdales have short, thick necks compared to most breeds). His chest may need some widening, and some muscle put on his shoulders and legs (which would perhaps look good set further apart?). You could also emphasize his knees a bit.

For his back end, I would keep his hind quarters unaltered, as they are pretty much the right shape. The back legs however, could do with some stretching below the hocks. Hooves (unseen under feathering) may need to be bigger.

Other than that, good job and keep up drawing horses!