Pastels or charcoal ?

This is a hard pastels painting (a drawing, really, 

but called a painting because it is in pastels) on white paper. 

I can see here that I am getting better with pastels, using several layers of different colours to tone down, define the form and correct mistakes. 

But that right buttock is waaay too bright.

Same model, same day.

Using a softer black pastel, not quite charcoal but easy to smudge.

The stomach is not defined: I should have spent longer on this one.

The tutor liked the use of flesh colour, white highlights and tiny touches of turquoise here and there.

I love a bit of turquoise.