I was commissioned by a neighbour to paint this from photo references (which I find difficult) for a big birthday present. Being a neighbour and my first real commission, I did this for a low fee, but would need payment to cover 2 days minimum for other portraits. I would expect to be paid at the same rate as your plumber/electrician/decorator, though the skill levels and training are probably greater for a painter. I would also be open to paint pet portraits either as drawings, pastel paintings, acrylics or oils by request.