Golden Persimmon ~THE ENDO~

Uh-huh.
If the problem were with the fingers, I would have fixed it; I've done it before. But I tried holding the phone like that myself, and yes, it's a real grip, and the thumb hides behind the screen

That logic is certainly sound. Now I see it too. Although at first glance, it seems like there's an empty space where the ring finger should be. That gap is quite noticeable.

The problem lies in the lines of the artwork. It's like a line, but it's a bit strange, disappearing unexpectedly as if in patches... If it were real clothing, the lines would be solid, and there would probably be folds and shadows, because such clothing, if it's a sweater, has a shape, not just a flat surface.

I don't know, I don't know. Maybe the artists know better about what folds and shadows should be.

But I still don't see any problems. There's volume, and that's the main thing.

And I can't agree that every artist should draw all these solid lines in absolute photo-realism.
Maybe the person drew it as best they could and doesn't really understand lines. Or maybe they just don't like drawing clothes.