When I saw Helles Belle's awesome shark mouth nose art:
I got in contact and asked whether I could use that on one of my skins, my personal fictitious Spartans Squadron.
With Helles' kind permission, I did so and here it is; Spartans Green Crimson Shark
Extract the archive so you have a folder called "Spartans Green Crimson Shark".
Paste that into your DCS World > CoreMods > aircraft > AV8BNA > Liveries > AV8BNA directory.
Then, in DCS select the skin called "Spartans Green Crimson Shark".
Thanks very much, Helles Belle - please keep up the great skinning work!