First of all, it is certain that trademark application has nothing to do with copyright registration. The trademark is handled in the Trademark Office, and the copyright is in copyright registration Hall. There is no cross at all.

Secondly, if the graphics are original by your company, it is suggested that your company conduct copyright registration. It is helpful for legal cases that may occur in the future. But this is not a necessary procedure.

Finally, it is not recommended that you act as an agent in this company. Change it.