I stumbled onto your project today when I was searching google for King's Quest 4. It's been a very long time since I last played the original and also a very long time since I last worked on anything in the "art" field. I used to sketch quite a lot and in my late teens and early 20s I spent a lot of time tinkering with 3d models and environments (using programs like Bryce 3d, Maya and Poser).
I'm a little unclear on what sort of 'artist' you are looking for. I am not a professional by any means, and am quite rusty. I would be willing to volunteer some of my time to help out your project if you still need help. Could you please tell me what programs I would need to use, and whether you are looking for stills or rendered animations or just models etc?