its about practice, i spent months doing i think its called "les keys" or somethimg like that, pretty much i would take really small piece of canvas ( about the size of my hand) and then i would make a still life , i dont know, something like a skull and some drapes and grapes on top, then i would put a 5 min timer and in 5 min i had to do as much as i could trying to render the best i could with less resources, all this using oilpaint. This makes you incredibly fast and allows you to work quick without leaving quality behind
