I begin with a sketch I made from a photo, and generally I work further from that sketch in watercolour in Edward Seago's style.
The watercolour can be seen here on Flickr https://flic.kr/p/24PgvmY

Edward Seago

Colours used
Yellow Ocher or Raw SIenna
Alizarin Crimson
Ultramarine Blue
Aureolin yellow because Chrome Yellow don’t exist anymore!
Burnt Sienna and Burnt Umber
Lampblack
Light Red

Brushes

I used some brushes here that I normally seldom use.
The flat oxhair brushes are made for lettersetting art.

I usually have two red sable brushes a 6 and a 12 Da Vince Maestro Tobolski Kolinsky

Three W&N Squirrel wash brushes I used them a lot so I cannot see the size anymore
I have a huge Squirrel brush I seldom use and that is a size 10, so my guess would be I have a 2, 4 and 6 size squirrel brush. Also found under Petit Gris
Blue Squirrel brushes are the best, but also the most expensive!
http://www.winsornewton.com/uk/shop/b...

And some riggers for detail, size 0, 1 and 4 W&N Sceptre Gold

Paper
I use a variety of papers, but in most cases StCuthbertsmill paper, like Bockingford, Millford and Saunders Waterford. when I do a style I try to use the painters choice! (when available)