I'm really looking forward to this map!
There is just one thing, and it's the use of plants. I hope you're not going to use the plants shown in the screenshots. From what I can see on your map, the setting would be in the "city". There would be no natural plants growing from the ground or the roofs, as they are bricks and cement all over the place with no cracks in them. Also, the trees in your map are too thick/cactusy, the trees that are in Santorini are very thin and not so high. And the plants under the window would also be wrong. The plants that are in Santorini there are colorful plants in pots.
I know this might be a weird thing to pick on, but if you really want to make the Santorini atmosphere right, you should look into it.
I was there last summer, and that is what I remember, anyone correct me if I'm wrong.
Also I got some photos of the view from 2 different cities if you're interested. The first two are from Oia (first picture you see the "capital", second you see the island Therasia(not the center volcano island)). The two last is from right outside the capital(3rd picture you see the volcano island, 4th you see Oia at the left). Not the best pictures but hope it helps depending on where on the island you plan this map to take place.