Really cool Pointillism art project! Must use secondary colors made by placing varying amounts of primary colors dots in close proximity. Science focus: how eyes will "mix" the colors and close the shape without a visible line.
Artangel: Mixed media crumpled tissue technique - tutorial - basically, glue tissue paper over a canvas, let dry. Paint, let dry, then rub pastel or chalk over the surface to highlight the texture. Would be an awesome way to vignette around a painting.
These are some basic techniques and tips that you can use to create chalk pastel artwork. You have to know that chalk pastel artworks are pretty different to look at and this is because the techniques used in it are different.
All about TEXTURE - 20 ideas Mixed Media Art Tutorial