iceman57 wrote:+1 got same question, I'll say "colour" but thanks to organizers to confirm

I don't get the +1 thing. Must be a French thing.
I think some leniency should be granted over the black/white and colored thing. Some artists choose to draw in one color or another. That does not make it a colored shikishi. I have a shikishi where the artist did the design in a blue pen. The item is not colored, but the ink they choose is blue.
Additionnaly :
- is a marker signed photography or magazine cover supposed to be consider as a "picture Shikishi" ?
- is a signed cel consider as a "plastic Shikishi" ?
- is a signed pencil (no ink no marker) original art consider as a "Shikishi" ?
In the case of the first question, the rules state you can only submit the portion where the artist sign/drew. If they signed a poster, you can only submit the portion of the poster with the signature.
Previous cel awards have allowed signed cels to be submitted. But then, I would think that the same thing applies - you can only submit the portion of the cel where the artist signed/sketched.
As mentioned, shikishi are boards that most people use to obtain signatures from artists. The most commonly used are the blank white ones, but I've seen some where artists have used patterned ones.