Hey this is a great beginning. I too make my own tools. I used old xacto blade on one end and a pin on the other. Other DIY tool you could explore are pinhead for smoothing and negative space and rubber tip tools, I used them to nudge putty into basic shapes.
I haven’t tried grownstuff for a whole figure yet but I think it’s too soft and easily marked. I think it needs a diferent set of tools from greenstuff, something with larger area to shape and smooth it.
Tired is enough.
I like tiny miniatures