War Link by darkt3co

Really interesting concept, and I like the drastic change to his character design to match! It definitely gives off the vibe that he's a hardened fighter.

Some thoughts on making him more tired: he looks rather stiff right now, and I think it's because all of his limbs are pretty straight. It might be interesting to have him leaning forward, bending one or both of his legs, or maybe even leaning on the tree there in the foreground, just to emphasize that even standing is difficult. Doing a quick Google search for "tired people" shows some poses you could take for inspiration.

Some unsolicited thoughts: the tree looks a bit small compared to Link? I like that it's sparse and lifeless looking, though! Adding some leaf-less branches might help fill empty space at the top of the image and provide more visual balance.

This all might be coming a little late since you're already working on the lineart, sorry about that! I think his drooping head and downcast eyes do a pretty good job of communicating that he's tired already --- the above feedback are just suggestions on how to push the concept a bit further.

Hope that helps!