2ND:
Also I realised the hand on the right is kind of cut out for some reason. (Probably cause of the vest) But I will fix it next time! Feedback is great thanks!
The first one has nice lighting but the posing is a bit odd and elastic.
The second one could do with a bit of a posing check as well, but my main problem is the hdri you used in the back, try and find a low poly scene so it fits more with it.
In the first one, it looks like the character is floating above the landscape.
The second one looks pretty good for being your second gfx. I am not sure if I am seeing it correctly, but it looks like one arm is going through the character’s torso, but it could just be the camera work.
Great work though!
Lighting is poor, and on the second render it looks as if the magazine is sticking out the side of the rifle.
Adding more shading can help, as well as background blur to filter out the “impurities”.
I also recommend adding contact shadows, otherwise it looks like photoshop gone wrong.