1
First step
Draw a capital letter O and use this capital letter O as the center point of the snail.
2
Second step
Draw two more large circles on top of this O, so that the snails back is basically completed.
3
The third step
Draw the snails body and mouth with lines on the underside of its back.
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4
Step 4
At the end, draw the snails tentacles on the snails body, and you're done.