Thank you Colin, that fixed it. I appreciate your help. 
The solution raises an interesting question, fully specified here on SO if 
you're interested:
 

>
> http://stackoverflow.com/questions/31306347/rails-carrierwave-has-many-error/31345762#31345762
>

The question is, is a solution possible with only a single column in the 
Picturething model? Having two columns seems redundant when they are only 
ever going to hold the same value (the character_id)?

Thanks again!
 

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