This coloured mandala is from my Big & Bold Mandalas Colouring Book, and is coloured in pink, yellow, purple and green with with Copic Sketch markers.
The 50 original designs in Big & Bold Mandalas have extra-thick lines and large spaces, which makes them easy to colour. This is a good book for kids and beginners, and for people of any age who are looking for simple designs. You can see all the illustrations here, or buy the book on Amazon sites worldwide.
You can see more coloured pages from my books in the Colouring Gallery.