I wanted to mention that "oil" looks can be achieved in a similar manner as the chalked portraits....
The process is very similar:
-Smudge technique is the same.
-Background is painted (smudged) as well instead of left as textured "paper". You can paint in the background that is part of the photo already, or add your own coloring, but if you replace the background, add some noise to it, or color gradients and paint the background as well.
-After running the sharpening on the painting (be sure to sharpen the background as well) Skip the background chalking, and accent embellishment chalking. Instead, run the texturing filter on it to add a canvas texture to give it an authentic canvas look.
If you plan to print your finished painting on canvas, however, send the printer the untextured version, and let the actual canvas do the work. Your texture will compete with the actual texture of the true canvas.
Results:
Detail crops: