I have found that the following works well:
Photos taken outside, on an overcast day. Clear skies are to be avoided... as is direct sunlight. Lighting is then bright but diffuse, with shadows kept at a bare minimum.
This lighting should work very well with most smartphones,
I have to admit, even though I have a iPhone, the Samsung photo quality is, I think, somewhat better
No flash of course
Pretty close to yours Sky Zero... your photos are good