Trying to paint a figure without a proper holder/vise can be frustrating . Well here's a quick any easy solution .
Drill and pin either one or both feet ,if the figure is kneeling ,drill the knee in contact with the ground ,same for sitting etc ,drill and pin the contact area .
Use a cocktail stick or paper clip depending on the size of the figure . Leave a good length on the pin for now .
For smaller figures (54mm) etc Get an empty Tamiya jar , fill it with Blu tak , silly putty or plasticine ,drill a hole in the top the same diameter as the pin/s ,Now cut your pin so it reaches near the bottom of the jar And simply push the figure down onto the top of the jar , the plasticine / silly putty will hold the pin and secure the figure.
If you want ,put a small drop of CA on one foot just to be sure ,it can easily be popped of with a sharp blade later .
For larger figures ,just use a bigger jar /container
If you're worried about it falling over use Spud's tip on widening the base
Chris.