Alt text in combination with images from another source / url

[fctexel]

I have a feed that is parsed on my website. All images do come form another source( and url that differts from my site). However I can change the alt text. I concerns hotel mages worldwide. In order to relate the images with the different language  I want to add a small phrase "airport hotel" translated in the  laguages that are present on my site Example alt text will be alt="airport hotel: Mercure Schiphol Terminal"  or in German alt="Flughafen hotel: Mercure Schiphol Terminal"

Will this have a positive effect on my SEO despite the url of the images are not related to my site?

[Dan-Petrovic]

Externally hosting images will not be a major problem and ALT text will be seen as part of your page content.