I have come across several lists with some suggested characteristics shared by successful writers. I found this one by Robin Gardner to be particularly helpful. The 9 Signs of an Amateur Artist at Skinny Artist also struck a chord. As I have had some quiet time to actually focus on a writing schedule, I realize how much I usually let other things get in the way...so much can be accomplished with undivided attention!
A cautionary tale-- I am now on Facebook so these lists were found during time I spent distracted by my computer!