@Draco Artn perhaps any or all of these strategies in composing pictures can be considered whenever you want to help add feeling illusion of depth… 1. diminution- when 2 like objects appear in picture and smaller one is interpreted to be farther away, for example add a person in foreground to be much larger than tiny distant person in picture 2. Foreshortening- like in comic books when a thigh pointed in direction of viewer appears shorter than a person standing straight upright, not much opportunity here to apply 3. Convergence- using rules of perspective, such that lines parallel in world converge in drawing to point on horizon line, like if you were to add any object, building or road and its lines converge to vanishing points on a horizon line under math and laws of linear perspective 4. Aerial perspective- objects farther away appear less detailed, and more blurry because atmosphere over miles of distance changes our vision. This is often used for landscapes, and very important here 5. Overlapping and “T” intersection- in line drawing show one object in front of other how one line stops another. For 2 D animatiors this trick makes line drawn characters look Like they exist in 3D space. The line on top is usually darker. and thicker than other line. So if this landscape is purely a line drawing you could make choices about how to emphasize/ bold t intersections to depict rock outcroppings in front of or behind one another. Bonus option- As to composition in general, it may help to plan some contrast to have a distinct dominant value for each of distinct zones of landscapes into foreground, middle ground and background. i hope that helps.

I like how you construct the torso

I like your lighting