Overall it's shaping up to be a very good image, but there's still 
something which doesn't feel quite right about it.  I suppose it's that 
the elements don't quite fit together.  It feels more like the various 
parts of the scene (sky, ground, wreck, person) each was created 
independently of the others.

For example, there's something about the transition from the haze above 
the ground to the sky that feels artificial.  I know that you'd want to 
avoid too much of an atmospheric effect obscuring the sky, but I think 
that something more than the uniform ground fog would be beneficial. 
Maybe adding more of a texture to the fog would be enough to do it though.

Along these lines, I noticed that the hair of the girl is blowing in the 
wind, but that the mist on the ground seems totally uniform and 
perfectly still.  I envision a ground mist in a scene like this having a 
much more intimate and dynamic interplay with the forms of the landscape 
and the wreckage.

The wreckage also seems to have merely been placed upon the ground, 
which presumable in the case of a real wreckage would not be the case. 
Either there would be clear marking of the crash, or if the wreck had 
occurred in the more distant past effects of weathering as buildup of 
sand and such around the base.

As far as the landscape itself goes, I feel that it's too smooth and too 
homogeneous.  There's a rather clear scale where the features on the 
ground stop, and this is rather distracting on the nearer of the 
landscape features.  I would imagine that in `reality' rocks as jagged 
as these would have a good deal of texture on very fine scales as well. 
  I've found in cases like these that adding detail to a level which in 
the actual render ends up being smaller than a pixel manages to help 
with this.  Though since this is a preliminary version of the picture I 
can understand avoiding the render times associated with this.

The coloring of the rocks is also pretty much completely uniform. 
There's a bit of texture on there, but I can't discern any interplay 
between this texture and the form of the landscape.  Since the forms on 
such a landscape arise in part from the nature of the rocks in which 
they are built, adding a bit of variation in the coloring different 
features of the landscape (or in this case having the coloring depend on 
the values of some of the functions which you use to generate the 
isosurface) can help a good deal, even if it's too subtly to be 
consciously noticed without careful inspection.

Anyway, i don't mean to nitpick, it's a good image and I just wanted to 
point out things that i noticed about it!

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