You can create links by adding rel="nofollow" tag, which is not searched by search engines. You also should add nofollow tag to the links, you think it doesn't need it.
It's crucial to use alt tag and to make sure search engines know what you are talking about.
You should not have too much external links on your website.
Other wise this will affects your website negatively.
Please be warned that to describe security status of we use data openly available on the Web, thus we cannot guarantee that no scam sites might have been mistakenly considered legit and no fraud or PC issues may occur in this regard.
But usually the crowdsourced data we have is pretty accurate.