Action Details
Requirements and how-to articles for ArtStation's action:

Companies can host challenges on ArtStation in which users can create and submit artwork to fit a brief provided by the host.

You need this to get it done:

Challenge Name
The name of your challenge. Briefly describe the theme of the challenge and/or what is required.
The deadline for entries and the date when winners will be announced.
Describe your challenge, what deliverables are required from entrants and the judging criteria.
Challenge Rules
The rules for your challenge, such as what type of work may be submitted, eligibility to enter and grounds for disqualification.
The prizes available for the winners of the challenge.
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

ArtStation - Challenges
ArtStation's page for challenges where you can browse current and past challenges as well as submissions.
Link missing here or found errors? Improve How-Tos