Can I post a model or sprite early?

[Spriter Theo]

So according to the What Makes a Good Submission page on the Wiki, the VG Resource will "only accept content for media ripped from commercially released, or notably reputable released games". So that would be a no in this case since your game has yet to be released.

However, if you would like feedback on your work, feel free to post it in the Game Development forums.

Best of luck on your game!