This is quite good, the shading on the mountains is very nice and I like the loose linework too. I also like the footprints in the lower corner, they show that you pay attention to detail. This kinda feels like a preliminary sketch though, it might be nice if you were to go at it again and add some more extreme highlights and shadows to the mountains, as well as tidying the linework a little and darkening the sky (maybe adding clouds?). Still, the picture has a good layout and it does work as it is right now. Keep up the good work ^_^