YouTube video / animation would be covered under 3.i as rendered imagery (still or moving).
I believe 3.ii covers your question regarding using HiveWire animals to render art that is then sold on tee shirts (or in books, as book covers, posters, coffee mugs, etc.).
In both cases, you render the content as a 2d image and are allowed to publish/sell that 2d artwork.
I believe the commercial license is for using HiveWire content in games. In that case, they are using the 3d models rather than the results of a render.
BUT ... to be absolutely sure your intended use is within the EULA, you could use the
Support Page.
II. LICENSE AGREEMENT BETWEEN SELLER AND USER
A. License Grant for transmission of Content from Seller to User For any transmission of Content from a Seller to another User, whether the transmission was the result of a license or free download, the following terms apply unless more restrictive terms are specified in the area provided by the Company for custom license terms:
1. OWNERSHIP. Unless explicitly provided for in custom license terms set forth in the area provided by the Company and which must be subject to acceptance by User before or at the point of sale, the Seller retains, subject to any license agreement between the Seller and the Company, copyright in Content purchased or downloaded by any User via the Company. In using the Company systems and Website, You agree that any additional EULA, license, custom license, or Seller requirements inserted into Seller products in any area outside that explicitly provided by the Company are invalid, void ab initio, to be treated as invalid and without effect as they relate to those purchases.
2. VALID LICENSE. Any license rights relating to Content For Sale via the Company are contingent upon the transfer of money from the User to the Seller. All license rights terminate immediately and without notice if a sale is reversed for any reason.
3. RIGHTS GRANTED. The Seller grants to the User who either purchases license rights to For Sale Content via a Valid Sale, or downloads freely available Content submitted by the Seller, a non-exclusive, worldwide license in any medium now known or hereinafter invented to: (a) promote, publicly perform, publicly display, digitally perform, or transmit for promotional and commercial purposes; and (b) use the name and likeness of any individuals represented in the Content only in connection with Your material. The User license to Content in this paragraph applies to standard For Sale Content. Any sale, posting, sharing or republication, including sale or distribution of Content is prohibited. For illustration, approved distribution or use of Free and Content includes, but is not limited to:
(i) as rendered imagery (still or moving).
(ii) as Content published within a book, poster, t-shirt or other item.
(iii) as part of the creation of a not-for-sale, not-for-distribution physical object such as a toy, doll, or model made strictly for personal use by the User.