So here are tons of HDRI with alot of various uses. Im making the link to the Free set but there are ones you can pay for or become a member and I give members 10 new HDRI each month. If your a member then you get access to all the Zbrush brushes as well as all the library now, and from now on.
Free Zbrush brushes here https://gum.co/TalS01
• There are 16 individual Zbrush stroke type brushes all free.
And free HDRI here https://gum.co/KFJRHDRiFree01
• The HDR library is currently at 75 HDRI and its growing by 10 every month. Jump in now and see!
Zbrush tech brushes.
• The Zbrush IMM brushes is currently at 160 brushes.