Thank you for the warm welcome!
I started the first term yesterday, and I'll try to contain myself and follow the weekly schedule, not jumping forwards. It might take a few weeks until I get my drawing display so I'll start the daily assignments traditionally with pen and paper. I'll probably have to keep doing the pen control excercises after I get my new display to get used to it too.
I did the image adjustment assignment and I was pleasantly surprised how close I got to the originals. I've actually worked with Photoshop and colors quite a bit in this manner (I've worked around 5 years in an advertising agency, so did lots of photo editing there), but I still tried to really dive into what I was doing and study the values and tools.
Even so, I'm actually pretty terrified of colors and color theory is something I want to learn more about. But It was nice to notice that I could see what I had to tweak to get it right, like "oh, this needs more yellow" or "this tone needs to be a bit more saturated, cooler, warmer" etc. So I guess it's really true that practice trains your eye to notice this stuff.
The numbers behind the color spheres aren't 100% the same, but I'm trying to avoid nitpicking and focus on grasping the general idea of the assignments.
The one I really had trouble with was the last one. I'm quite happy with the outcome, but there are still some differences, for example in the knee area. The blue tank thingy is also a bit more saturated in the original.
I'll start the pen excercises today, and post some results later in the upcoming week!