Super late reply, so apologies!
None of us actually owns the picture (the original owner being absent from DA), but I'll assume you've completed your special request and already provided credit.
Just for future reference to work by DuneTrekker (or any artist, really), so long as you provide
proper credit and, if possible,
a link to any art available on DA, it should be fine to use the artwork in a project so long as you
do not 1) make profits from said artwork (even if the art is not the focus or is part of a larger project) 2) redistribute said artwork without permission/credit 3) disrespect, alter or abuse the artist/their work and any copyright they place on it.
I hope this helps and good luck with your future projects!