I'm still newbie in painting and stuff but the electronics are just fine. Just changed the opamp to OPA827 (jfet input is necessary to make the circuit work with the high input impedances)
(https://i.ibb.co/HB8hBNh/20210124-230730.jpg)
(https://i.ibb.co/F6J5M4s/20210124-230721.jpg)
Very cute!! and SMD too!
Nice work.