Hmm, this looked like a canyon to me at forst blush, was it supposed to be a mountain?
I’m not much of an artist, but I’m an astronomy nerd, which means I’ve seen my fair share of photographed craters. Oftentimes, if the light is shining from the bottom of the image, craters look like mountains and vice-versa. So maybe some extra shading at the top for craters and at the bottom for mountains might help sell the illusion of depth?