Very impressed with the quality of your work, regardless of your age. One item that’s sticking out to me though. Have a look at the length of forearm to upperarm and perhaps the length of the arm overall. The forearm seems long, should be roughly equal to the upper arm.
Hands are getting a little “mushy” post posting. Make sure to reinforce the impression of bones pushing out in the knuckles and the like. This should be a predominate feature due to the character’s age.
Maybe overdoing it with the gathered leather of the image right arm. It feels like straightened, that sleeve would droop to his ankle. Would be good to carry some creasing into the pants and the jacket though. Specifically in the groin, the fabric appears very taut.
Finally, posing wise he feels a bit static. You have that wonderful long beard that right now you’re just really taking out to the side. Get some “S” shapes into that to add interest to the feature.
As far as the body goes, I’d suggest thinking more about the silhouette of your pose. Right now you kind of have a jumble here, with that scythe crossing the line of the body and the tangle of arms to manage it. If you put your ground in white and your character and props in black you’ll see what I mean right off. The silhouette doesn’t read clearly. I would suggest moving that weapon out to the side, in one hand, with the butt of it on the ground. This will open the silhouette and give you some room to work on the pose of the body, without that linear element obscuring it.
From there, I’d suggest altering the stance. Right now your line of action on that torso is pretty much vertical. Shoulders are over hips, everything’s horizontal. I’d suggest grabbing a mannequin from the lightbox and playing with posing with a proxy prop. Knock off several quickly until you find a few you like with dynamic lines of action, some twist and bend in the torso. Then select one and muscle your creation into it.
I know that’s a lot of possible changes and rework. So I just wanted to close by saying I’m really impressed with the ability you’ve shown here. Your materials are very strong. Your sculpting ability is obvious. You’re going to do great things, I think. Stick to it.