To transfer to Maya, make sure to follow the step.
1. Sculpt and paint texture in ZBrush.
2. Apply ZRemsher to clean up wireframes.(Make a copy first then apply ZRmesher)
3. Apply Project on the new model to get details from the original model. (Before apply Project, make sure the new model has enough subdivision.)
4.Creat UV map. (Zplugin/UV Master)
5.Export texture from Polypaint. (Zplugin/Muli Map Exporter)

Exproting Texture from Polypaint
How to convert from ZBrush polypaint to UV texture




1. Open Muti Map Exporter
2. Select Texture from Polypaint
3. Adjust Map Size (Output size)
4. Flip V ( UV map should be upside down in Maya)
5. Create All Maps