Just to re-emphasize NucMedTech's pointer, re: pastels, just make sure and get 'chalks', not 'oil' sticks. The oil based type won't grind down properly. Chalks are easy to 'pulverize' on sand paper then apply using a brush.
Working with finely ground pigments is a lot of fun & quite versatile. If it doesn't go as you wish, it can be wiped or washed off (only dust after all...)
Regards, Robert