I like it. I can see a lot of the effort you put into it. So, good points:

1. I really like the hard light you put onto the face, ears and handle to draw more attention to them compared to the softer lighting on the rest of the clothes.

2. The posing of the character as a whole is very good. Besides the head, I keep going back to the position of the feet/ankles, those feels natural.

3. You really have a knack for backgrounds. Either that or I'm just a sucker for them. The quick, short brush strokes being used to give whisps of clouds just tickles me! Around the large setting sun you have that moddled pattern amongst the orange. The clouds parting ways to make room for the sun gives a feeling of something great. I don't remember what it's called; it's like how people enjoy broken circles in art more than solid complete ones, it's psychological like that.

Stuff I would like to point out:
1. The pose is, as a whole, very good. But the left knee and left arm both look stiff. You can absolutely tell the dude is running, but I don't remember joints looking like that mid-stride.

2. Some of the clothes tend to get muddled together. I had trouble telling which leg had the joint I pointed out so I used which arm is forward to confirm it. Perhaps some shadow differences, light on the clothes closer to the viewer, thicker lines, different colors(?).

3. The hard light on the head, ears, right hand and axe-handle are great, I love it. The rest of the shading somewhat suffers. You can see where you used the dodge tool or used white paint. Maybe a blur would help soften those lights.

4. Compared to the sky, the ground is nothing. I know you meant to do that to shift attention, but yeah. I think he's kicking up something while running but I have a hard time telling.

Regardless, I like your piece. Thank you for posting!