A piece I made back in first semester freshman year of college (so 2006). I'm posting this for =InuKagomeluvrs, who wanted to see an example of an oil pastel piece using a blending method with turpentine.
Size: 36 in x 24 in
For reference:
Van Gogh Oil Pastels Arches Paper (don't remember exactly which one, but it's really thick) Turpentine
Method:
I drew this from a photo using a grid method. (If you want me to explain that, let me know in the comments.) I laid down a couple of extremely scribbly layers of the lighter colors in the skin tone, and the midtones for the darker areas. Then I went in with a little bit of shading, still pretty generalized and not too thick with the pastel. Then, I laid in some of the lighter areas a little thicker, and started in with the turpentine. I used a couple of crappy old acrylic brushes dipped in turpentine to blend the beginning layers. As I added more layers, I continued to blend with the brush (though not for every single layer, otherwise you'll soak the paper). If you get impatient like I do, you can layer the pastel on thicker as you go along. Just be careful, because once it's down, it's pretty much impossible to remove. You can kind of scrape it off with an Xacto knife, but the key phrase is "kind of."
Great technique. For some reason I've never thought of using mediums or solvents with oil pastel. Will have to give it a try if this piece is any indication of the possibilities.