A great purchase! Even for a grown dino enthusiast, this book is worth it. The illustrations are superb, with informative text besides. A few typos here and there, but nothing too egregious. My only major complaint is that the book does not contain any dino contemporaries such as pterosaurs or marine reptiles. They would have been nice to have. Other than that, this is everything one could possibly want, with a wide range of species available.As for the coloring itself, it actually works really well. Both crayons and colored pencils work beautifully, and while I do not use them, I would suspect markers do as well. One can still see the outlines even with dark colors (save possibly for black), and so long as you keep within the lines, the dinos are guaranteed to look excellent.The one thing to be wary of is potential bleeding of colors from previously-colored pages being pressed down. This is easy to fix with a strong eraser, though.The illustrations are accurate and up-to-date, which includes some of the animals having feathers. It's a nice way for people to learn what the current thinking is. For the casual audience who may not know of many species, this book is a great way to expand one's knowledge of these ancient beasts.Overall, this book is perfect for children and adults alike, and is worth every penny. Go ahead and buy it.