How to participate in the Art Show? Not so difficult...
MadKatherine can help - she usually has the information for getting display panels and signing up (more forms... not diifficult).
I don't know about digital picture (photoshop) printing for art show quality - most of what I do is pen and ink/prismacolor for display.
However, adding a mat to the pictures is the next step after completing the drawing. Finding a good color contrast is helpful - but I try to keep my eyes pealed at the Art supply stores for sales. Remember that the picture is better off with a cardboard backing - and wrapping the piece in some form of film or plastic protects it from random fingerprints.
A form is usually supplied by the Art show to put on the back with Title, Artist, Address, Min Bid (sometimes even the "quick sale" price) and identification number...
After that - the finished art is hung (usually by the artist) on the designated panel, more forms completed for Art Show inventory check-in/check-out and bid sheets (these are usually coordinated with the form on the back of the piece) and everyone gets to "oooooooh" and "aaaaaaah" at the result. Then, if there are bids or sold pieces, the Art Show coordinator will record that information and get a payment to the artist after the art show has the books completed. The Artist can take all unsold pieces down at the end of the show (or make arrangements and payments to get the artwork shipped). Don't forget you can also display pieces "NFS" (Not For Sale)...
Now... where are those sketches?
I've got work to do!