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https://gyazo.com/abb063d7e45b924eb6d98ddb18352dd4

I cannot find where the guest profile images are handled, i've checked the inspect element to no avail.

www.shroomnation.co.uk/upload/portal.php      < take a look here for yourself. 

Thank you for your time in advance. 

Check portal_announcement templates, I feel it should in those portal templates.