So I just opened Tomfoxdraws's book, "Drawing Form and Pose", and first thing I read just blows my mind. less is more, go for simple shapes, confident lines, and decide well where you place your marks. He says that the most common mistake for beginners is complicating things too much, adding too much detail and thus there are a bunch of lines with no clear decision behind them.
I'm just going to write that down here for future reference and for anyone reading if it helps. Also PSA Humble bundle is selling a huge art bundle including Painter for like 30$
cheers