For lack of a better name and because these are truly purely me, I call these the K Rocks. Painted with pencil, gel and Posca pens and detailed with ink, these little rocks are so colorful you'll want more than one.
I make them to order as well, so because each is unique, you may get a slightly different expression or pattern. The rocks are sprayed with matte varnish and then a semi-matte sealant is added on top. This does not mean this rock is meant to be left outside in the rain and all weather, I recommend you display your rock somewhere where it won't get directly wet, but it can still accompany a plant.
A note on size: because I pick the rocks on the shores of Lake Michigan, the size will vary but this is how I approximate them:
Small will be 2-3 inches
Large usually between 4-6 inches