I've been working on a 6ft canvas of figures in a landscape.
Here's is a picture I took of myself in the mirror at the studio before starting work on it.
The photograph above shows the brushes that I use.
I ensure that I have plenty of choice. My jar-full of brushes is dominated by large flats for blocking in colour, but there are always some small round sable brushes. These enable me to control line with precision.