Nice one, I like it! Like the other one, I don't like the two little ships, they are distracting and unnecessary in my opinion. I'm not sure if they are flying or on the water, the proportions between the other boats, mountain, distance seems wrong, and look more blury for focus than movement.
If you want to add the ships, start again with one and try to do it perfectly, now when you look at the image you know instantly that is something wrong with them and don't belong to the picture. Analyze why or what people have to say and try different things to fix it, it could be a nice exercise XD.
I assumed these were crashed ships but the image leaves me guessing. I'm not getting crash here. There's just not enough evidence to support that. Can you imagine the damage that something that large would have if it crashed with any speed? It would be severely broken up and damaged. Even on a low gravity planet there would be some devastation. A ship of that size would have been assembled in space, probably in orbit around a planet. It's internal support would be massive but it would probably not hold up well during an impact even with a low gravity planet.
Great idea and you have done an exceptional job, but I think it needs more work to be convincing.