The first FSX screencap (with the aftermarket terrain) looks like someone who wasn't very skilled with photoshop took a picture of the ocean, and then just straight-up posted a photo of Kent over top of it.

The second one with the Fighter looks like someone took google earth screencaps and crudely drew a road over top of it, then used it as a texture for the old turn-based Combat Mission game and added stock houses and trees.

What FSX does do very well (with aftermarket packs) are cities and mountains. not so much the country and shores.