Dude, don't listen to him.
Mr_P3rf3ct, you're hardly the authority on industry art practices, so please don't try and sound like it. It's pretty rude to knock someone's information aside like that, especially given their comparable experience to your own.
For someone to say that you have to use Photoshop to be an artist, yeah I'm knocking that aside. That complete bs. If that was the case, there wouldn't be CS Paintor, GIMP, Paint Tool SAI and all the other programs. It comes down to preference. If they want a specify file type, as long as your program allows you to export in required format you're fine.
I never said I was some artist guru. But from the artists I've have conversations with, all in the industry, you're not REQUIRED to use Photoshop. It's just the one that has pretty much everything you could want. That's why a lot of artists use it. Unless you're an artists with years of experience, please don't try and undermined me like that again. I'm asking nicely.
& B. Cullis, you were being so helpful in the other thread. Why like this now?! Lol