I know your post states you need no additional 3d artists, but here's my thing. I'm simply looking for resume and portfolio padding. I am currently just getting started, and do not yet have much to show as far as my skills go.
So here is my pitch, If one of your artists drop out, Or something comes up and you need additional help, I'll work for just the ability to put any work i create for you into my portfolio. The completion time depends based entirely on what it is you want me to create for you.
I appreciate your time in looking over my offer, please contact me back at your earliest convenience.