Like these! 2.5x3.5, they're about credit card sized~
They'll be 20 USD a pop not including shipping! Shipping within the US is 4 and outside 8 unless stated otherwise. Prices may go up for the next round depending, and i'll only take 4 for now!
I also have a dropbox for past watercolor examples I did, granted, these were on canvas and i'm no longer doing canvas watercolor commissions! They were the same dimensions as the cards; these are just to provide further examples if you're interested. they're quite a bit dated though argh ;;;;;;