The trick to render Povray images of crystal structures using Ortep-3 is to use "mouse labels" - which the File, Write Povray File interface will allow you to select a Label Atoms option under the GENERAL tab. Thus atom labels will then be rendered by Povray.

Open up the structure in Ortep-3 which can read a variety of file formats including CIF, Shelx, GSAS, Fullprof and Rietica-LHPM Rietveld

In this case the structure is of tetracycline hydrochloride - "Tetracycline hydrochloride: a synchrotron micro-crystal study" Clegg W. & Teat S.J. Acta Cryst., C56 , 1343-1345 (2000)).

Do File, Open File and select the structure file of interest and get the view you want (or do cell packing via the Contents Menu).

Select Labels, Set Mouse Labels and i) click on the atom of interest, then ii) where you want the atom to be and iii) then the bottom left OK icon. Repeat until happy then select the Cancel to get out of Mouse Labels Labels mode.

Now select File, Write POV-ray File and select the rendering options you wish to have (including "Label Atoms" under General) Labels mode.

You should now have a Povray file (Titled Ortep0xx.pov) in the same directory as your structure file. Go into the Windows Explorer (or your favourite File Manager) and select (double click on) the file to automatically spawn Povray.

Select using the top left dialoge the resolution you wish to render the image at (800x600 is shown here) and then click on the Run icon.

If you don't like the results - play with the various options until you find something you do like. If you only want a bit of the structure, you can also render at higher resolution and crop the image. The image at the bottom of this webpage is using "rusty_iron" bonds; "rust" H-bonds; and "speckled finish" atoms.