The biggest issue I have is it doesn't really feel like the ship crashed there. It feels more like it was just placed there. There's no impact crater, debris, etc.
I did a rather dirty paint-over to illustrate my point:

- added sand 'piles' to show impact (probably should be bigger depending on force of the impact)
- added damage/crumpling to the haul of the ship to show the force of impact
- added some sand piling to the front rock structure (others had done previously)
- added more shading to the rocks around the ship to (I feel) better reflect the light source (based on the lighting on the ship)
Hope it helps!
edit Ilyich's edit does a great job on the sand!
I did a rather dirty paint-over to illustrate my point:

- added sand 'piles' to show impact (probably should be bigger depending on force of the impact)
- added damage/crumpling to the haul of the ship to show the force of impact
- added some sand piling to the front rock structure (others had done previously)
- added more shading to the rocks around the ship to (I feel) better reflect the light source (based on the lighting on the ship)
Hope it helps!
edit Ilyich's edit does a great job on the sand!