This list is primarily for my book illustrations. But it can be modified for any type of creativity.

1. Draw everyday.
2. Redraw the same image MANY times.(Not just a couple drawings or even 10, but 20 plus drawings to help your brain figure stuff out.)
3. Redraw the same image until you’ve practically memorized it.
4. Use quality materials. I’ve tried cheap materials many times and it only makes things more difficult.
5. Draw from life.
6. Draw from photo’s
7. Draw from memory.
8. Change mediums. You never know what your brain prefers to create with.
9. When sketching, use a pen so you can’t erase. If you don’t like what you did, move over on your paper and redraw it. 
10.  Remember 80 to 90% of what you draw will not be good. Your brain is trying to work things out.
11. If I need inspirational images I will choose from only respected and well known artists that I like as reference. This helps keep my taste in check.
12. If you’ve been working on a drawing for a long time you might consider taking a break. Your brain will continue to work on it even if you’re doing something else.`