look at this gallery first. plz 
and comment my work
I am newbie at this so I don’t now all functions yet
but if you have an idea of what to change, write it here 
psst: some textures are comming from “free textures” sites,
should I list up those sites? 
yes, please do.
You may wanna set some things smooth, like the sea.
hmm, it’s a nice start.
some comments:
overall, you have to learn the shadows in blender. only spot light casts shadows. you also have to press down “shadows” in renderbuttons, to actually render them.
if you like the lighting otherwise, you can add extra spot, and turn it to “shadowsonly” spot.
the inside scene, the second picture, lamp is not casting any light? also why there is grass on the wall? 
if you want smooth surfaces, use “setsmooth” in editbuttons… also, like the coastline, you perhaps want it a bit more round… try experiementing with subsurfs (again in editbuttons…)
well. it’s getting there. mostly I would worry about lighting now…
.b
ok yes I have tried to make shadows with all you said but… :Z
I dont get why I have tried with spot and stuff
what is “smooth”? anyway