Skelly

Just downloaded the Skelly App.
Looks like it should be useful.
One issue with it is that you can't save your pose to come back to which is annoying (although you can take a screenshot.)
I can see myself using this for tricky poses.

Edit: Can now save poses - will use much more now :-)

Accurate drawing

Don’t choose to be more expressive simply because you’re not capable of accuracy yet. Expand your abilities so that you have the choice. 

Stan Prokopenko