I recently sculpted a Giant Bug. the wood it's sitting on is about 5cm (2") long by 8cm (~3")
Pretty big sucker. I'm happy with how smooth I managed to get the carapace of it. I reworked the head 3 times. First as a Rhino beetle, but I made the head to tall and wasn't happy with the horn. Then I tried a version like it is now but it was too big. then I chopped the base structure of it down and gave it a smaller head.
My inspiration was from the Devourer in Frostgrave. Not a necesarrily bad creature but not something you want to get riled up.
I'm going to make a mold of it and then make a variant of it with different shell textures to practice my sculpting on.
Right, off to make a mold box while the pictures upload...
Comments and criticisms welcome