For my own likes - and mileage widely varies with regard to what people find to be intuitive - I like Argile and Blacksmith3D's Morph app, both of which are reasonably affordable and very easy to use. Of course, they cannot be compared to ZBrush, which is an industry standard and therefore more robust. But if what you're after is just an app to rearrange some facial features to make your characters look different, they're good options.

Poser 8's morphing tool is a big improvement in that it can now morph across zones/body parts. Some people do amazing things with it, including expression morphs. I have no idea how....

Others use magnets, also inside Poser.

If you want to do direct painting, a number of apps are now capable of doing that (although BodyPaint, which I think comes with Cinema4D, is probably considered the standard in that particular field). Blacksmith3D's paint app, 3D Coat etc. I think even Argile can do it.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3