freebeer
No problem, we are happy to offer help.
I've never mapped islands, but perhaps someone with wisdom and/or experience will pipe up.
My first idea is a multipolygon, to carve the islands out from the water.
Second is to add landcover detail, like treecover if applicable.
In reality, I would seek out an island that does appear, study that, and cheat by copying.  But I do not see anything within a stone's throw of here, so I can't offfer  a quick solution.  I'll look around...