Things are looking good! Don't stress too much on the circles or the pressure sensitivity parts, those will come with time and practice. I still struggle with them at times, but I've found that I am far more competent than I used to be due to the daily practice.
As for you image corrections, I think you did good. Probably could have upped the highlights just a tad more on the top one. The 2 in the middle look good. The final one is a challenge for everyone, and I think you got yours closer than I got mine hahah. It's a little less saturated then the target image, but I think you did good.
Keep up the good work Ola! You're doing great!