Leonardo Da Vinci: "I say it is far better to draw in company than alone for many reasons: the first is that you will be ashamed to be seen among the draftsmen if you are unskillful and this shame will cause you to study well.In the second place, a feeling of emulation will goad you to try to rank among others who are praised more than yourself.
A third reason is that you will learn from the methods of such as are abler than you and if you are abler than the others you will profit by eschewing their faults and hearing yourself praised will increase your skill."
Image of Leonardo Da Vinci by the master himself
