I have always wondered how artists can flit from medium to medium or genre to genre. I would have thought it a lifetimes work to learn to watercolour never mind use oils ! I have dabbled in watercolours perhaps seduced by the facility to make paintings quickly but it always seemed unsatisfactory to me. I recently came across a statement by Maggie Hambling "particular, be particular. Generalisation is always the enemy of art " Seems to sum up my feelings too !