Texture Map Painter
Left drag on the sphere paints. Drag off the sphere or right drag to orbit. Scroll to zoom.

Brush

Painted into the map as is
1.00
45
0.60
0.40

Channel

Map

Flattened UV, paintable

Surface detail

1.00
0.12

Mid grey is flat on both. Brighter pushes out, darker pulls in. Turn Displace to zero and Normal up to see the difference: the silhouette stays a perfect circle.

Light

35
30
2.2
Colour the light picks up under the skin

Load an example

Each example fills every channel at once so you can pull one apart and see what it contributes. Solo view shows the raw map on the surface.