If you're feeling a bit unstimulated at the moment, you might get some insight as to why with this quick and simple exercise from Eric Maisel's marvellous book, Coaching the Artist Within.
Just write at least a paragraph in answer to the following three questions:
What generates mental energy?
What saps mental energy?
What replenishes mental energy?
The Difference Between Stimulation and Refuelling The answers I came up with weren't earth-shattering but enough to give me a timely reminder of the subtle difference between stimulating and refuelling.
External stimulation such as looking at the work of other artists,gets me working but going inwards to refuel or replenish is what helps me stay the course.
Feel free to share your answers to the questions in the comments below.