Download the pattern, print it and cut out the pattern. I chose to use different fabrics for the front and the back of the monster:

Pin the pattern on the fabrics and cut it out:

Serge the part which you will use later to close the monster with a blind stitch:

Cut out the felt eyes and sew them on the front fabric:

Now fix the felt tooth (or teeth if you want to give your monster not just one tooth) while you sew the mouth with a narrow zigzag stitch:

After you fixed the inner eyes you simply stitch a cross on the eyes by hand:

Stitch the felt heart on the monster front:

Now pin the front and the back of the monster with needles and sew the two parts together - but leave the part open which you will use to turn the monster inside out (the part you serged before):

Now you have to cut some parts of the monster: the ears, over the little arms and between the legs (like shown on the pattern you downloaded). Serge the monster with a zigzag stitch - narrower on the parts you cut:

… and this is the best moment when you create monsters and any kind of dolls and stuffed things: When you turn it inside out and see the final creature. Still a very flat monster - but already a monster

It’s almost finished. Now we only have to stuff the little beast with doll wadding and close it with a blind stitch by hand:

That’s it!