The dahlia image on the right was prepared in PicSketch. I then used that black+white rendition to produce the colour version on the left in AutodeskPixlr using only one effect and a highlight overlay. It amazes me that, obviously, somewhere in the b+w version’s metadata it has recorded the original colours, so that the flower colour shows through. The wonders of colorspace technology.
This is the image that started me on my doodling adventures in nov2016. Using a very basic app called Sketchpad, the original is the far right version. I did create nine differing colour sets in AutodeskPixlr, but I prefer these three. Phototastic Collage app provides the presentation.