This is something I wrote for a few friends of mine who were constantly complaining about art block but I'm sure it can pertain to all things that require creativity.
There is no such thing as art block. What people often refer to as art block are actually signs of improvement. “Everything I’m doing sucks today/this week/this month” etc., etc... Sound like you? Well let me tell you this. That is not art block. You have finally reached the peak of your current knowledge and possible skill level that derives from that knowledge. Everything starts to look terrible because it is terrible! It is a good thing that you are skilled enough to recognize your mistakes. “But then, why can’t I draw if I’ve improved so much?” You know damned well why. It is time to study. Most people who get art block quit temporarily until they “regain their skills”. In actuality, they are letting their skills settle back into their original state. That state of mind where you cannot recognize the mistakes you have been making all along and think you are doing fine or decent when in reality you just are starting back where you left off before this so called “art block”. You should, instead of quitting during the supposed block, power through it. Gesture draw, read anatomy and colour theory books, experiment with new styles, browse through inspirational art. The worst thing you can possibly do during this period of time is take a prolonged break. Well, of course, unless your goal is to revert back to your previous skill level, by all means go ahead and quit. Just don’t expect sympathy when you are complaining about the plateau that is your art skill when you know damned well you need to practice and study even during the rough times. You as an artist should know this and know it well; art takes time and patience. Art block is just a poor excuse not to do your best.