Nice work Peter. Good to see new participants
Working with pastels and charcoal is a challenge. Smearing goes with the material, and demands special care. I used to use fixative, hairspray actually. It requires very careful use as Ivan mentions. GO VERY LIGHT ON EACH AND EVERY APPLICATION! You can't hurry the stuff, or it will stuff-up the piece.
I no longer use a fixative. Now I remove each piece from the sketch pad and put it into a plastic sleeve book. No fingers, no smears, no risk of damage from spraying.
You can also look to practice sketching by working from a photo. Nothing wrong with that. You can practice and develop your technique this way too. Will give you a different insight into sketching as the finer details will test your capabilities, and helps you determine how to best render these yourself.