Five Figure Fanwork Exchange

That first tag is a possibility, though I wonder if it might make people think they can't offer it unless they've seen the paintings in the 1994 book. I also see that this is a closed canon as the artist is unfortunately no longer alive.

Perhaps:
Fantastical Paintings - James Christensen?

Re: 6 Bird Hunters in Full Camouflage - it helps matching if there is at least one character in the set and if there isn't I'd need to add a placeholder/dummy tag. So you could have:

Creator's Choice of Painting (James Christensen Paintings)

or alternatively,

6 Bird Hunters in Full Camouflage (James Christensen Paintings)
Creator's Choice of Painting (James Christensen Paintings)

so that you both have a specific painting to match on and a wider option?