, I know I am not in your faction, but I have some ideas.
After looking at your wip on flickr, you have a pretty good start, the rocks are fine. Some sort of rough sea would be cool, similar to what Mark does. On top of the rocks, instead of a somewhat random mixture of brown, tan, and dark tan, something to think about would be to have brown near the front fading into dark tan, and then into normal tan. That has been done pretty effectively in other mocs recently. Little patches of green throughout would make sense since it is near the coast, too. If you could incorporate a palm or two, that would be nice. As for what is going on top, I think a lighthouse would be perfect, and would make a lot of sense on a point like this. You could even make it fortified, and incorporate it into somesort of castle/city wall. Also, if you choose to put anysort of building on the point, make sure move out the brown/tan/dark tan plates underneath to make sure you conserve them. One last thing that is good to see is that you are not mixing any yellow with the tan.
I hope these suggestions help you out. Good luck with your moc!