Looks good Hannes! The elephants are a nice addition. I like the colors and atmosphere. As Frank said the depth is great.
You might consider slightly decreasing the haze density to make the background-mountain a little bit less blue and hazy.
But it should remain blue and hazy of course, like in real life.
It's a pity that TG still can't handle the edges between water and land a bit more naturally. It looks a bit like it's floating.
Nonetheless a very good image!
By the way...the accaciatree you mention is not shown below. Also...I have seen a DEM of Kilimanjaro somewhere in the past. I'm quite sure. Shall look if I can find it!
Martin
edit: I can see the image now...probably was too fast replying