Well, I do.
Usually I can´t keep an art project going on for too long, because I keep getting new ideas from another themes.
For example, someday I have an idea about a new superheroine, then I create the character, develop a plot, a villainess to fight (and probably kill) her, and many stories involving those characters.
Then, during the process of creating all those scenes, I came with a new idea, maybe another superheroine, maybe something with a different theme: medieval, cyberpunk, fighting, and my excitement goes invested into this new thing, so I put the older one aside for some time, until I get another new idea (or my excitement for an older one returns).
And so it goes on…
This is one of the reason I started to do my stories in 4, 5 images instead of full comics. This and the fact that I embraced Iray as my main render engine, and it take ages to render a scene.