Its easier to evaluate from these clear shapes if I got it right or wrong.

So using techniques that force commitment will make me do more decisions. More decisions will give me more right and wrong decisions.
Finding the wrong decisions shows me what I need to work on. And that's how I will improve

I now understand which angles of the head are difficult to draw for me.

If I see something off with the proportions or alignment then I am able to deduct which step of the process I made a mistake in.

For example I realised that I make mistakes while drawing 1 side of a cylinder at certain angles.