Like many others I grew up watching Bob Ross. One of his favorite sayings was "there are no mistakes here, just happy accidents. You can learn to work with anything that happens here." For me this is the true joy of art. Does the line you just drew not do exactly what you had in mind? Take a minute, look at it and see if it has brought to light something you hadn't thought of before. Perhaps its better than you originally intended. So rarely does any picture of mine end up exactly as originally pictured in my mind, but the end result is something different or greater than I had planned. Throughout our daily lives we adhere to the rules of the society we live in, and for good reasons. But when it comes to art we are free to imagine and create, and perhaps create something better than we had set out to do. For me this is the ultimate joy of creating.