With good motivation ideas can be developed over time. You can have all the best tools, but without motivation they won't do you a bit of good because skill can't be bought with money. Skill is bought with practice, and to practice takes lots of time and (you guessed it) motivation.
I say motivation, skill can ve developed, ideas too, with time the mind starts to work mor efiently in that area, tools can be obtaines with time too, but motivation has to be there nad be natural can't be learned, or developed
I really wanted to say motivation, but I think that ties in with skill. If you don't know how to use your tools and the picture you end up with doesn't turn out to be as good as you planned it or it takes a long time to do because it's so hard, then that hurts your self confidence a bit and makes it hard for you to want to start again. I honestly say this from somewhat of a personal experience. Say I'm having trouble during the sketching phase or some other phase with like effects. I'll get really frustrated, take a nap, and start over again. I don't like to feel like that.