10-Minute Sketches (From a Beginner)

Hello!
I use to draw/sketch in my spare time but I stopped for the most part but now I kind of want to see if I can pick it up again.
I started doing 10-minute sketches (I limit myself to 10 minutes a page to see what kind of stuff I can create in that time limit). I'd love to get come critique!
Thank you,
Dani
1) From the song 'The Unthinking Majority'

2) Characters from the TV show 'Drawn Together' - Spanky Ham, Wooldoor Sockbat and Ling-Ling'

3) Concept from the book 'Zen and the Art of Motorcycle Maintenance

I use to draw/sketch in my spare time but I stopped for the most part but now I kind of want to see if I can pick it up again.
I started doing 10-minute sketches (I limit myself to 10 minutes a page to see what kind of stuff I can create in that time limit). I'd love to get come critique!
Thank you,
Dani
1) From the song 'The Unthinking Majority'

2) Characters from the TV show 'Drawn Together' - Spanky Ham, Wooldoor Sockbat and Ling-Ling'

3) Concept from the book 'Zen and the Art of Motorcycle Maintenance
