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Declaring variables

(let* ((width 200)
       (height (/ width 2))
       (img (car (gimp-image-new width height RGB)))
      )     ;; closes the list of variables
    (gimp-display-new img)
)
When in doubt, use let*
script-fu uses semicolons (;) as comments.

You don't have to use two of them, but by convention a lot of people do.