Being dark and moody sometimes is not such a bad thing. Of course you can not offend someone else for no reason but as far as you keep your emotions in line it is a very needed thing.
Seeing how stressful our lives are nowadays, especially if you are an artist,then it is good and only natural to have some down moments. I have those too and when i was younger i even went too far and got into a depression. Which we all know is nothing good. It affects you and your family. Everybody who is in contact with you.
Now this is when these dark monents come into play. You can release that anger or frustration you have in you at that moment so that you can move on. That can be anything. Doing martial arts, or singing,listening to rock,dark metal or drawing something sad. Or happy. Only you can decide what and how can free you up from the black thoughts.
To illustrate the idea, i choose to show my batman colour pencil drawing. It shows the strengh everyone should have.
I included a link to my verification post, that all of the content posted here are done by me: https://steemit.com/art/@edgarsart/edgarsart-original-art-now-verified
I also have an Ebay where it is possible to purchase somre of my original drawings:
http://www.ebay.com/usr/edgarsart