connecting drawings by form and technique

https://fariavancreij.kabkfinearts.nl:443/files/gimgs/th-19_IMG_8526.jpg
https://fariavancreij.kabkfinearts.nl:443/files/gimgs/th-19_IMG_8532.jpg
https://fariavancreij.kabkfinearts.nl:443/files/gimgs/th-19_IMG_8529.jpg
https://fariavancreij.kabkfinearts.nl:443/files/gimgs/th-19_IMG_8528.jpg