Dan M
Thank you Murad for the very detailed explanation; I personally use Vallejo so the experience of thinning and airbrushing is probably a little bit different. I already see some mistakes I made: holding the airbrush with only one hand while the other holds the model or trying to do it freehand without any marks on the model (like you did with the pencil).
What surprised me the most was the part with the clear gloss. I noticed something like this with Vallejo as well: if I thin the paint too much and I lower the pressure the paint doesn't seem to grab anymore, if I open too much the nozzle then it's like spraying water, it flows everywhere, if I keep the nozzle more closed then it's like the paint is barely visible.
So there are definitely some areas of improvement on my side.

Spanjaard
airbrushing tutorial, thank Murad!