hehe !
i must admit i know almost nothing about geology, where you can found this or this tree or plant, if the paputitus cumulus can be present with 23°C...
i never, never, never try to do something like in the real world... i am not able to do it and i must admit i don't care
but... your totally right about the perspective, we are not sure what it is while looking at the render... as for the sharp edge, i'm disapointed (well not really) because some other told me the same thing and i liked it ^^
anyway, thanks for the critics and the info about the rocks, i'll try to keep that in mind for the next one