While I want to call this piece a study, I can't deny I just like drawing my stuff too
A spec-ops Ranger set up in a tight room, ready to pop some heads with his armor defeater rifle.
On technique, I gave you a slightly lower mark just because the proportions of the lower right leg and boot brought my attention to them immediately... They just felt wrong. I would expect the lower leg to have similar dimensions to the upper leg. I have tried to reconcile the length to a different position than the one evocative by the foot position but I just can't. The boot itself seems to have been placed as an afterthought, a little more detail on it could have given it more realism. I believe you were faced with limitations in the composition spacing between the hole in the wall and the back wall where your sniper is resting. Perhaps you could have tried playing with the position of the leg to account for this situation. Or perhaps moving the hole in the wall a bit more to the right, increasing the length of the rifle barrel and fixing the length of the lower leg. I would have loved to see the flexing of the boot's tip against the wall to show more detail and realism in this section of the painting.
The work on shadows and lights was very effective and helps develop the ambiance. Your painting technique evokes a type of retro postcard art... "Postcard from the edge" seems like the right theme here... "Reach out and touch someone" could be another.
I read all the comments and found it interesting that no one noticed that you drew a left handed sniper! The right hand is seen holding the front of the rifle for stability and the rifle's butt is seen resting on the sniper's left shoulder. I was initially missing the trusty handgun until I realized that being a lefty it would be on the sniper's left hip holder. Have to ask if these details were done purposefully.
I'm curious about the cylindrical canisters on the right leg's hip holder. What should these be? I see the position makes perfect sense if you want to access them quickly, assuming they are set tight inside the pouch and that the pouch has a cover to prevent the cylinders from falling while the sniper is running. And it seems plausible that the section in front of it (to the right of the cylinder case) is the cover that was flipped open to access them. I just realized that these canisters could be food rations to be ingested through a port on the helmet. They might fit the circular port on the right side of the helmet below the three ocular lenses.
I guess the cylinder that has been identified as a battery pack would serve all the gizmos inside that nasty looking helmet, since I don't see an exoskeleton or would expect it to be powered by something that small. It could also be the environmental control that keeps the sniper cool under that helmet. I would suggest a cylinder that provides oxygen for the rebreather unit that not only provides comfort but protects him from chemical warfare. Perhaps to include as well a unit that condenses the soldiers sweat, filters it and provides drinking water for long duration missions.
I greatly appreciate your artistry and the idea you brought up in this painting. I love the scifi war genre and your work succeeds in bringing the spectator to this place you created and to delve in the possibilities of your creation.
Thanks for sharing this world you are creating with us.
I liked how the scope of the rifle had a close-mid range sight on it, just in case. I am wondering about what that case on the shooter's back is. Probably a powering unit, When I first saw it I thought it might be an ammunition container but that only works with chain-guns. I noticed the small SMG or bull-pup assault rifle on the floor. It has a lightly flatter coloring than the rest of the picture, which makes my think is was added in as a last minute thing. Overall it is a excellence picture with some nice shading that gives you the impression that the hole int he wall is the only light with another hole in the ceiling.
This armor looks like to a mix of an armor of some video game like Halo or Mass Effect or Gears of War or Call of Duty with the army uniform or looks like to the armor of a character of Gears of War or Call of Duty and could be inspired by some movie.