I would like to see the mother tongue to be included in the profile (and profile picture)
My mother tongue is German and I use Duolingo to learn Spanish, but my problem is that although I am not bad in English I do not always know if a offered translation from Spanish to English is right. The translations sound sometimes very odd. So when I ask a question in the comment section, I think it would be very good for all users to know if someone is a native speaker or not (or which language actually is the mother tongue of a user), I think it would help to respond faster in an appropriate way. Also it would be easier to seek help from native speakers, if I am learning a particular language. What do you think?
Good idea. The weight that learners give to comments naturally depends on their proficiency with the languages being discussed. This could be graded from Native Speaker Very proficient Reasonably proficient Intermediate Beginner
or some scale of this kind. This would be useful to know for both the target language and the source language.
Sorry to complicate the suggestion.
I would keep it simple too, as Tiago_Moita suggested, especially when you look at the tiny image or the name for the first time. In my opinion in this case "less information is more", but I could imagine that the additional information you suggested could be displayed when hovering over the image/name of a user