I am a writer, not an artist. If you are interested in the amazing work of the illustrator, check out her page at
The Crossbone Pirate series has been illustrated by AndrewMartinD , Ferroth , and currently by sonicfreak276
Other story illustrators are,
the-fire-prince and Randomthewolfskie
Hungry for more Nightriders you say? Then check out the works of two of my good friends on deviantart.
Blue Mario is now my designated Nightriders anime Artist who provides new Nightriders art on nearly a weekly basis including some for side stories. There's some good stuff here. He is a great artist as well as a good friend.
Another user I would recommend you check out is my other longtime deviant art buddy The-Kiwi-Gremlin
Kiwi Gremlin has a long running comic strip known as the Randomville Series which the Nightriders are often a part of. He has fun story lines as well as his own caste of fun characters.
You can view his work of Axl in my favorites here.
And here in my favorites you can view random Nightriders art from contest commissions, fan art, memes... ect