Yes sketching is a real fun challange
Quite unlike all those CCD's Photometers etc.
I remember observing Mars for an hour or more
Just to catch some glimpses and slight improvement of detail.
Most of those drawings were from 20 years ago or more.
Preparing the correct planetary templates
And trying to add colours.
All hard, imprecise and great fun!
Best of all it's so cheap compared to imagers, DSLR's etc
Improves your vision and teaches you HOW to view.
It's all too easy today in some ways.....