Brain Games - Color by Number: Stress-Free Coloring (Pink) Spiral-bound – 1 Feb. 2017

Now of course, you're not obliged to follow the authors' colouring. Assuming you do want to follow the suggested colours, I think you'll need a fairly large collection, like Ohuhu 200 colour set, since some of the colours are pretty sophisticated, even though each picture uses 6 colours on the average.

Stress reducing activity - Daughter was most appreciative and found it relaxing during lockdown 3

Good book, just a shame aome is already coloured in. Would be better completely blank.

Like the concept. Hinge crushed presumably in transit, so pages rip out when turned.

The book is amazing for relaxing and fun patterns.