Removed infected image; Virus threats still remain?

Hi
I recently embedded an image inside my website (http://www.alastairhumphreys.com) from an external URL. It seemed to have a problem (see attached image of results when I ran it through SiteCheck).
I immediately removed the image at fault. SiteCheck seems quite happy with my site now, but some Avast users are still reporting problems.
Please can you advise?
Thank you.

Several security issues on that domain / IP:
http://urlquery.net/report.php?id=1410791660685

Balck- / Yellow listed:
http://multirbl.valli.org/lookup/104.28.15.28.html

Lot’s of hidden spam links are/where on the website:
http://www.unmaskparasites.com/security-tools/find-hidden-links/site/?siteUrl=www.alastairhumphreys.com

Blacklisted and SOA problems:
http://mxtoolbox.com/domain/www.alastairhumphreys.com/?source=findmonitors

SOA problems:
http://dnscheck.pingdom.com/?domain=www.alastairhumphreys.com

Blacklisted on one or more lists:
http://zulu.zscaler.com/submission/show/630098fd9a47072b94485a28f2cfafa2-1410791471

If you truly believe the website is clean/safe, you can ask avast to review your website:
www.avast.com/contact-form.php

Hi, the domain was unblocked yesterday 18:30 (CEST). If you are still experiencing your users being blocked, please send me a PM or post here:-).

Thank you!