STEP 1 – Get a flag somehow:

STEP 2 – Identify weed. Draw/photograph/otherwise make an image of it: 

STEP 3 – Make a grid to scale and put it over the image: 

STEP 4 – Transfer drawing to flag with wax pencil. The grid helps. Coffee and blind faith helps: 

STEP 5 – Paint in the drawing with fabric paint:

STEP 6 – Paint paint paint: 

STEP 7 – Outline the painting with wax pencil:

STEP 8 – Add dimension, tone, shade: 

STEP 9: Done! 

Now repeat 20 times.