>>1012801 (OP)It took me 1 second to see this is handpainted.
But it will probably take a decade of practice to get to the level to be able to quickly deconstruct how exactly they painted this, and I'm not practicing it, so I can't really help further.
Beware of exceptionally faggot responses in this thread like
>>1013875 which make it sound like a rendering question instead of texture painting technique.