I did actually sew a bit here and there though, for example a zic zac stitch around the white belly patch. I had to improvise... since I could not find any felt in our local craft stores,I used some white and grey fleece blankets I found for 2,99 Euro the piece to make the teeth, belly and fin. Like this one:
I am pretty happy with the result and so is my shark boy.
And here he is: