It's really pointless to monitor your logs for all suspicious activity, it happens, mostly they probe for common scripts (..phpmyadmin/wordpress/etc) and see if there is any misconfiguration.
Some others attempt various forms of code/form injection.. or look for cross-site scripting (XSS) vulnerabilities.
In this case, the long string in this request is the "referral" from whomever was browsing the site, they found your picture on Google Images, it looks malformed but not overly suspicious.
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