If the paintbox is small it definitely helps
Sketch it in with Burnt Sienna paint
Then just color in like a coloring book
Get to know your paintbox colors
Make loose swatches of each color in blobs of water on a scrap of paper
It's easier to do if your water is dirty - easier to see that is.
This Paris paintbox is on the to-do list. The trouble is not eating the macarons in the setup