Suggestion: Sample sentences link to related images
Basic idea: All sample sentences in the vocabulary area is linked to an image that's relevant to that vocabulary word and sentence.
Duolingo can license or use group common license of thousands of stock photos (with tags). In user's vocabulary section, each word and sample sentence has the option to display a photo. The default photo is the one most users selected, but the user has the option to change the photo to a more relevant one.
Benefits: Duolingo has a crowd sourced selection of photos linked to sentences for their training program. They can then display photos to depending on how the question is presented (either during the question or the answer portion). In addition, I'm making flash cards in Anki of the vocabulary I learn here. It'd be nice to have photos quickly accessible to copy over instead of searching Google images for the sample sentence.
Basically, I'd display three photos with the three sample sentences clozed deleted meaning I'm not translating from English but instead I'm figuring out the Spanish expression.
Please consider it as there are billions of photos out there and this only helps language learning (speaking from experience of using iKnow and Rosetta Stone).