Yes Mjcool...the edit button is at the bottom of EACH post for a reason. Except for the 'Spamtastic' forum, please use the edit button instead of double/triple posting. Thanks.
I highly doubt there is any artwork produced for Extractor or any low-tier bosses for that matter. Your best bet is to either; Take a screenshot of the boss when you're facing it or buy the guide. (The guide has artwork for most of the bosses)