I coloured this postcard with my twinmarkers, yes, the very, very cheap markers. I didn't bordered to do shadings, because of the tiny boxes/areas.
I really like colouring with these markers. And I also have a colourless blender and it is of very good quality! I have used it for corrections, as a eraser. I yet have to try it as a blender. I do have to say that I very seldom use any colourless blender, of any brand that I have as a blender. And I don't think I'll make efforts to do so frequently.