Slides cannot be the only tool for language teaching , we all know that. So , figure out how you will use it. I again, will tell the students to find out what is happening in the picture. They will think, pause, will try to connect the words with pictures and they will understand what is happening here. Feel free to use it, Bangla second language teacher. Just don't forget to give the maker a little credit. That's all. By the way, it is difficult to make a mind map in powerpoint. It does not look as good as hand painted one.