Just have patience in my opinion, if it doesnt work just clear your mind maybe log off of skype or the things that are disturbing you. Thats usually what I do.
You have to have inspiration and often it could takes months to finish a set on my part.
Just give it time.
Pretty helpful with those, But i've noticed my textures seem better when I have someone screensharing me through skype. Cause i get live feedback, and suggestions.
How I do it:
1. Choose a theme
2. Draw everything you can possibly think of relating to the theme to accomplish the set/head
3. Music on
4. Go with the flow
5. Feedback from Art thread/Skype pals
Don't expect to finish something immediately after you start it.