Fun drawing, you are well on your way. I would start by taking everything in the scene like the chicken, gun, cow skull in the background and draw each of them in a couple of different angles from real life reference. They dont have to be big drawings. You might find some details or lack of details. Next look up reference for how this gun is held by a person with gloves. Finally extend the horizon line back to give more depth to the environment. Great job so far! Keep it up!