Question about artworks

[Fuyu Flowga]

If I already submit to my Neopets artworks on other websites, like Deviantart, is that means...I can't use them to submit to Neopian Times or gallery?

[Sciurus carolinensis]

I don't see why not provided they are yours. I don't know if there is a specific rule on that. I just browsed JellyNeo's two guides on the Neopian Times, but didn't see anything that suggests otherwise. But my eyes are tired, so I may have missed something. Maybe they would ask you to prove they are your own work, but who knows how they'd do that. Anyone else know?