Hi Buffy
How you approach painting the backgrounds depends on whether you are doing a portrait which almost fills your paper OR painting an animal in its surroundings. In the first instance you may want to choose a background colour which compliments your subject with touches of other colours in the background which you have already used in your subject. This will help to bring your painting together. (Take a look at some of my animal paintings which are almost all done in pastels -
www.carolkibble.co.uk)
Carol
PA Wiltshire