heres the real answer, and to hopefully rerail the derailment of racism that sprouts whenever these threads are made
The obvious and most important one is their culture promotes very hard work. this is news to no one
The thing people dont consider is that their education is much more streamlined for the kind of art im assuming you want to draw. That style of art being an eastern (for lack of better words) sort of anime-like one such as the one in the OP.
In the west we have our fundamentals covered hard, but from then on really the only paths are cartoons, fine art, or soulless concept art/photobashes. If you want to draw stuff that isnt that its gonna take a lot of time to learn, and all you really have are half assed youtube tutorials. It's far from impossible but it will take time, dedication, copying, and a lot of aimless experimentation.
However in the east this stuff is *mainstream* so they have learning this shit pretty much streamlined if youre willing to put in the work. So many lessons and actually good tutorials/classes on this type of art (which tragically we cant understand). Seriously, have you ever seen anything in english that's even close to a krenz tutorial? There's even the artbooks I'm sure you've seen that teach you how to paint step by step in clip studio. We just have fucking instagram tier painting youtube tutorials. That's why they seem to be able to progress so fast.
Again, it's not impossible to learn by yourself but there's nothing that makes you progress faster than a good lesson to feed you the answers right to your face.
If you dedicated all your time to something more widely taught in America (where I'm assuming you are) like fine art you'd probably get good at that pretty fast.