Trying to get the right angle on the weapon can be very difficult. Not only are you wearing the boots of a 3D Artist, but also a photographer. What I do is look up photos of weapons being showcased, it helps me get good ideas of angles to take. When I take a screenshot, I save the Marmoset scene as SpringfieldXDM_Screenshot01, for example. That way if I need to retake the photo, the lighting and position are in the same location as when the screenshot was first taken. Ethan taught us a lot of these very helpful techniques throughout the course.
I also added a stables area, trees and props like barrels and benches to add visual interest to the environment and encourage the player to explore the area rather than heading straight for the end goal of the level.