Recently I discovered that Mercedes Helnwein, daughter of the notorious Austrian painter Gottfried Helnwein, does big size format portrait and figure paintings in oil pastels.
The series is called temptation to be good, which leaves a lot of room for speculation. I think it is great to see what can be done with those small oil pastel sticks. As far as I understand from some more footage that you can find on her website she is using Sennelier oil pastels. There is definitely a lot of potential in this medium.
The portrait illustration in this blog post is an trace drawing I did in oil pastel.