Base pattern here: eSCARgo pattern

Use the same pattern for body, but make the eyes out of black

For the shell, stop between R14 and R15 to stitch the face at the back of the shell. Use backstitches for the eyes and double them over to make them thicker.

Make slsts for the mustache: start from between the first 2 rows, go down 1st, go down and across 1st, go up and across 1st, go 1st over the row, go down and across 1st, go up and across 1st, and then up 1st (total of 7sts)

What it should look like

Before sewing the body and shell together, make mustache, suit and tie out of felt. Hot glue together and hot glue onto the snail's body. I forgot to take a picture of the mustache, but it's self explanatory