This coloring book, created for adults or very patient teenagers, is one of the nicest I've seen. I currently have a nice set of various coloring books but this one by Sarah Taylor is just beautifully done. Whimsical patterns and shapes come together inside animal bodies to create an enjoyable experience that also results is really artistic and great looking images when finished. I prefer to use colored pencils, but very thin markers would also look good if you want very saturated colors. The pages are thick paper so thin markers won't bleed through. I do prefer the subtle shading effects of colored pencils but since this is art, there are really no rules.