We just put a preprint on arXiv describing a number of improvements to the style transfer algorithm we developed a while ago. These new features include spatial control, color control and scale control.
Spatial control: applying different styles to different parts of the image (panel b).
Color control: transferring only the style of a painting, but keeping the colors of the original photograph (panel c). You can find additional examples in our blog post on blog.deepart.io.
Scale control: combine small-scale features of one style with large-scale features of another.