usually what I tell people in a case like this is to look for examples of what you are trying to illustrate. Don’t just go by what you see in your mind. Learning to illustrate is all about learning to “see” how things really interact in the real world. I’m not saying to find photos and copy them, you just need something to get the proportions right until it becomes natural for you to “see” for yourself.
For instance, yes the legs are too far apart. If you continue the legs up to the crotch, this guy is either starting to squat, with knees forward, or he’s been split in two.
The leg irons are pretty tight to this guy’s legs. The would be larger, looser and they would sag slightly to the weight of the chain. Also check details of what they would actually look like as they seem to be the focus of the illustration.
Perspective is off. Is he standing on a tunnel entrance over the railroad tracks, maybe to jump onto a moving train? Or is he supposed to be standing on the tracks themselves? If above them, the proportions are off. He would be a train height above them, not a table height.
Where the tracks enter the forest, the tunnel through the trees is too short. Again, the hole has to be train height.
Last item is what period of history is this?
Leg irons, pants and shoes should match that era.