Well, some of you have been requesting this for a while now and finally we have been able to accept and implement your suggestion!
We now have a head database plugin - available for you to use as of today!
To access the database, use the command /hdb - This will bring up a user interface which you can use to access over 14000 heads. More heads are added regularly and we can add heads manually on request if we believe they are warranted.
You can also use /hdb search | s [input] to search for heads in the database.
If you have any questions, please ask in #support either here on the forums or on the Discord Server.
As an added bonus, we will now be allowing player heads in Survival for FREE! we hope this will encourage people to build more in survival and give them an additional tool to help express their creativity.
Special thanks to @CallumW25 for purchasing this plugin for the community to use, be sure to thank him if you enjoy using it.
Thanks for your patience on this long awaited request and enjoy!