Cheap investment would be a carving gouge. Try it. See what you get. See if you enjoy sitting and carving.
If you like the texture you get with a carving gouge......try other gouges - shapes and sizes. We are talking about $40 per gouge.
Automach makes a reciprocating carver.....about $330. Get Flex Cut blades for it. Also get the spacer that allows the Flex Cut blades to fit. I find it much faster and easier.
Then there is a micro motor......used to be a maker of carbide cutters in Wyoming.......can't remember the name. Great cutters.
They work in a flexible shaft tool also. Bigger cutters with a 1/4 shaft work in the flexible shaft tools and in air tools.
To get the kind of work you are showing, takes lots of practice......no matter what tool one uses.
Also, might check with others in your local club and see what tools they have and ask to try them, before you invest in them.