Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.  You don't know how to make a good report?  See

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Currently, the caption of a picture (here the text "Description of the
piture") has the face `org-block':

    #+CAPTION: Description of the picture.
    #+RESULTS:
    [[file:./picture.png]]

I don't see any reason for the caption to use the same face as code
inside blocks as captions are expected to be human-readable text.

Attached patch introduces a new `org-caption' face applied on captions.
For conservative reasons, the new face inherits from `org-block' but I
can change that if you want.

Best

Emacs  : GNU Emacs 29.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41, cairo version 1.18.0)
Package: Org mode version 9.6.21 ( @ /home/cassou/.emacs.d/lib/org/lisp/)
-- 
Damien Cassou

"Success is the ability to go from one failure to another without
losing enthusiasm." --Winston Churchill