It is not; it's a very different kind of game.

Populous: The beginning?

Completely different to that.

Postal? Guess based on the hint, not the image :P

No, but that's much closer.

Crusader: No Remorse then?

Nope. Another hint: The image has been rotated 90 degrees.

The image is a bit small - any chance you could undo the rotation and provide a larger image?

There's a reason why I have cropped it to be that very specific size.

Also, as I've said before, this is a very well known game - people that don't know anything about games know about this game.

Uhm, this is a wild guess, but perhaps Lara Croft in her mansion in the first Tomb Raider? Background doesn't seem right tho

That is indeed correct.

Here's the full image:

Heh, the poster which was hanging over my bed almost 20 years ago had more rounded 'mountains' - no surprise I haven't recognized them ;-) Great riddle though! :-)

What can I say? I'm good, really good! Round of drinks all round on me!

Bloody hell that was a sneaky one though! Kudos to you sir! Once I rotated 90 degrees and zoomed they immediately looked like breasts from the early 3d era, but it couldn't be Tomb Raider because she didn't wear a gray top in TR1 and by the time of TR2 they weren't pointy anymore. Luckily I looked at some tombraider screenshots anyway and saw that in the mansion she wore a gray top, but that weird background threw me off, which as it turns out when you posted the full pic, was a window.

I'll upload a next, much easier one in a bit.

Ok here's the next one, from an old favorite of mine:

Is it a Mega man? It also has a Ducktales vibe from the moon level!