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From agage@mines.edu:
Since you're looking for feedback on improvement, here's what strikes me:
First, there isn't much color in this scene; for the sake of a lab, I
can see the need for plain walls, but it feels too plain.  Next, a tiny
bit of atmosphere to be able to see the beam from the light would be nice.

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From jjanger@mail.cspp.edu:
   A little bit of a brighter picture would have helped.

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From wozzeck@club-internet.fr:
Technically, you could try halos to show the light beams, and much more colors to give
an illusion of continuity. Then you could try to work out the scene itself.

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From libelle@webbwerks.com:
Looks good. The beam coming out of the flashlight looks dark, though.

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From sonya_roberts@geocities.com:
The image is quite nice, but there was a problem with the physics of it that even I could spot;
your source light is quite wide, but the rainbow coming from the prism is emanating from a point.
You either need a much smaller flashlight, a much bigger starting area for your coloured spotlights,
or a piece of cardboard with a small hole in it between the flashlight and prism to block most of
the light.  The banding in the rainbow is also a little strong...perhaps one or more additional spotlights
between each of the existing ones, in the "partway" colours, would have smoothed the effect a little more.

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From gmccarter@hotmail.com:
You have plenty of talent.  Good job.

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From cfusner@enter.net:
Ok, since you said you're looking for suggestions: 
1.) lower the angle at which the flashlight is shining. I don't believe
the ior would bend the rays *that* far.
2.) The main prob with the spectrum is that the circles of the 
individual spotlights are too obvious. Try giving the spotlights a nice
high falloff value, and if even that doesn't blur the circles enough,
consider the long, hard road of rendering 7 separate images, each with
a separate color then averaging the final images together. More details?
Email me and let me know. cfusner@enter.net

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From alex@astro.queensu.ca:
atmosphere would have added so much more

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From bsieker@techfak.uni-bielefeld.de:
Very simple, but still very stylish and good-looking. The spectrum is not
life-like, but I think that's almost impossible to do with the currently
available programs.