The water needs more detail. And the repetition of the grass is so obvious, it looks fake. Those really dark spots amidst the grass don't help much either.
Otherwise, it seems pretty cool. What's it for?
Looks likes somthing you'd find in a Roller Coaster Tycoon game or something... cool.
@Geo i was just messing around and ive only done like 1 iso thing before so i thought id try some iso