This coloring book has drawings that range from easy to expert. There are spiral designs that curve out in patterns that lend themselves to shading techniques or color blocking. This book does not have a specific theme, there are a variety of images.Included are both thin line images that allow the colors to be very close to one another. These will require a SHARP PENCIL. Also included are images with a 1.5-2pt line stroke.Future coloring books will specify the thickness and thinness of the image lines. If you prefer the thinner lines and the colors very close for "cozy coloring" and blending techniques you can purchase books with the lighter image lines. For those who prefer a medium line thickness, CreateSuite will be producing those coloring books. The thinner lines allow creatives to color and blend over the lines for an individual color design.Happy Coloring !