How difficult is it to do mosaic color composition homework?

I remember painting for almost a week! I painted the scenery of Jiuzhaigou, when the grid was 0.5 cm.

And the colors are similar. I suggest you find a simple one. It's best not to look at the color of the wish map, but to color it according to your own ideas. It's much simpler! Because it takes time to reconcile the same colors in the picture.