There are many differences between adult coloring books and kids coloring books. The main difference is how the complexity differs between the two.
Benefits of Adult Coloring Books
Uncolored Girlish Face for Adult Coloring Book in Famous Zenart
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Mandala Coloring Book For Kids Easy Mandalas For Beginners: Big
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Colour Therapy - an anti-stress colouring book
Floral pattern in black and white. Adult coloring book page with
Gift Kit: 5 Stress Relieving Adult Coloring Books with Pencils
Art Therapy Coloring Page Coloring Book Stock Vector (Royalty Free