Enjoy the process, have fun and experiment.
AMS - Avoid Masterpiece Syndrome, you can always get more paper.
Try working larger and aim to fill the whole page.
Use larger pastels. Use the sides not the tips.
Avoid from coloring in.
Try to put the color down in one stroke.
Try a rougher surface. The rougher the surface the harder it is to put in details.
Try not to blend after the under painting stage.
Stop painting when you start to repaint areas.
Forget the details compose with large shapes.
Accept what the painting gives you, embrace happy accidents and go with the flow.