So I watched a couple of videos on gesture drawing and tried some 2min sketches more. I also did a couple of 10min drawings and I must say I'm much more happy with the results.

I'M Spanish, I don't understand well English, but I'm lovely with this challenging, I have enjoyable time doing this lays using timer, 12 minutes every drawing, thanks Proko

5 minutes

30 minutes, except the last 15 minutes

25 minutes