Is there a way to turn off the human pictures on the App?
They're nice, but when I'm using the app on my iPad in public places it draws too much attention... It looks like a children's game... Makes me a bit embarrassed... I would prefer to have the option to make it more discreet by removing these pictures.
If anyone looks at you funny for that, I'd honestly be inclined to say it's their problem.
The other solution? If you're really honestly that embarrassed, make sure to practise the languages that don't have those pictures when you're out and about. (With the disclaimer that I mostly use the website, at least the last time I was on the app, some of the languages still had the photos.)
I don't know about for the app. I've turned off the pictures in the Chrome browser before. It was something like turning off the auto-load of images. I don't know if that helps but it's my only experience with it.
Just remember, 200,000,000 people use Duolingo. And there are even more people than that who have tried Duolingo. As time goes by, there is increasingly higher chance that the people who see you on Duolingo are aware that you're interacting with Duolingo. :)
I agree that it would be nice to have the option of removing them. I don't use the app that often, but find the pictures distracting and they tend to be more harmful than helpful. I sincerely hope that they will not be added to the desktop version.
Your English looks fine. I don't see any mistakes.