This is a really nice adult coloring book.  The drawings have enough detail to make me happy, but the lines are thick enough so I don't go crazy.  I color with Copic markers so I always want a book with thick paper and bold graphics.  This works well.  However, the images are printed on both sides of the page and the markers do bleed through.  With coloring pencils you should have no problems.  I also do not really care for the activity pages such as "complete the maze", "seek and find these objects" and  "draw a hat on this creature".  That's not what I color for.  There are a few pages like that in the book, but still enough strictly coloring pages to keep me occupied.