6 - Create SYMBOLS TREES GRASS sheet, and place it above SYMBOLS BACK sheet. Select this sheet to work with and choose Scrub icon (grass).

VERIFY if CC3 keeps the SYMBOLS TREES GRASS sheet or if it simply switches - it happens a lot to me - to the SYMBOLS TREES Sheet. In case of change, Select SYMBOLS TREES GRASS again

17 - Always Have the Rule of Thirds in mind.

14 - Because they are on the SYMBOLS sheet, once I refresh the drawing, they are automatically behind the trees (SYMBOLS TREES), in case you want the same effect behind, you will have to create a SHEET SYMBOLS hills/dune back and place it below from Symbols BACK and above Symbols trees back. That way they will also automatically go to the right place, under the trees behind.

13 - to add more colors to the drawing, select dunes and a different color, in this case I chose brown 36 (I believe), put them on the SYMBOLS sheet and choose their places quickly.

11 - Create one SHEET > SYMBOLS TREES GRASS and place it below the SHEET SYMBOLS BACK