how did i draw my symbols

almost in my symbol i'm using pen tools.
for the 1st step i draw heart shape

to fill in the color and want it become likes 3rd object i used the gradient mesh. i used gradient tool to adjust the gradient mesh inside it.

after i created the heart shape, i draw the tree trunk...also using pen tool.

to draw the trunk looks likes have shadow i just used brush to create it and put it at the left side of the trunk

for the factory i just using a square shape and the smoke i used brush

finally i just trace the map using pencil tool and edit it into the heart shape

DONE!!