Copyright notice:
AlternativaPlatform has full access to use my art as I (and every member of this game) have agreed to the EULA while registering an account. The EULA clearly states when a member posts any of his content, whether it is copyrighted or not the company has all rights to use it.
User hereby grants the Company the irrevocable right to use, unlimited in time and territory, the Material(s) which User has placed in the Game or has sent to the Company (including for participating in a competition) and that from the moment of placement (publication) or sending by Users of these Material(s) in the Game the Company shall receive right to use these Material(s) either to the extent required to provide the possibility to participate in the game and/or use the offered services or for other purposes, including the time-limited use in specific commercial and/or advertising campaigns related to the Game, and shall have the right to use the Materials for those purposes without restriction as to content, including in particular the right to place, modify, adapt, transfer or sublicence to third parties, create derived Materials, redevelop Materials, distribute, delete, reproduce, show publicly, make available to the public and effect any changes, reductions, additions, comments, explanations to the Material, to publish Materials, to use Materials and/or otherwise without specifying User and without any royalty or other compensation. User undertakes to provide legal grounds of rights’ transfer to the Company concerning the Materials placed by the User in the Game or on the Site. -Taken from the EULA.
However, everyone else has to take permission from me to use my work or if it's free for all they have full access to use it in whatever way they want. If I make art that is free for all it will be stated when posted. If the art was made specifically for you then you have the right to use it.