Embedded images and SEO?

On many blog submission pages, forums, and misc other useful tools which allow only nofollow links you are allowed to add images from other sites using its url. Often with bbcode [IMG][/IMG] or something similar via a pop-up box. Do imbedded images with no link have any SEO benefit? If so how much?
Please help.

About me:
I'm new in this forum, I am a web designer and have worked with multiple firms
You can check Supply chain Risk management video ,one of my work
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