I have, however, enjoyed the Pixel Art series and have purchased several of them. No outline of the picture behind the pixels. I have also mentioned in past reviews that I think it would add some fun if they presented an image that consisted of a plain white background with just numbered pixels so that we didn't know what the picture was until it was completed.
Some of the earlier versions had more complex pictures, some of them being reproductions of famous works of art, like pieces by Van Gogh and Munch, which were fun to see come to life in a Pixel version. In fact, there were so many of them in #17, I was able to complete the series twice between when it was released and In this latest series, #18, there are 28, or 35% of the total pictures that are the simple pictures that are outlined in black. However, the last two series, #17 and #18 have contained a lot of really simple pictures.
Pixel Art requires you to find the pixels and does show you literally every move like the Paint By Number games.