Hey I was wondering if photoshop work would be accepted in this competition.
If you're editing images, you need to cite the source(s). After that, we're fairly stringent on what passes, and usually require that there's some direct artistic input i.e. drawing, and not just transformation and filters.
The main reason for this is because in the early incarnations of this competition when that was allowed, some users would take an image and apply a few filters and post it here. Most images you find online, unless they have a particular creative commons license, would disallow that as it fails Fair Use criteria.
In short we wouldn't encourage it, but you could submit photoshop work. However the judge (at the moment yours truly) reserves the right to disqualify it on the above criteria, or if it is deemed to have "insufficient artistic input", and if a moderator thinks you deliberately omitted the appropriate acknowledgements or infringed on copyright, that could get you banned. It's a risky business.