sketching in the mall

Sometimes I like to take my sketch book with me and sketch people in restaurants, parks, etc. I am a little uncomfortable doing this as people will come up to me to see what I am doing. I don't exactly like to sketch them in detail but it is mostly their  activity that I am sketching.  Once on the plaza in Taos, New Mexico I saw an older couple seated on a bench and they were eating ice cream. Behind them  was a statute and I thought this would be an interesting sketch. Well no matter how I tried to hide my sketchbook they suspected what I was doing.I thought they would think I was writing a letter.  The lady came over and asked to see the sketch. I did show it to her although I had hoped she would understand I was not trying to draw them in detail. She seemed to appreciate my effort. The sketch above was in the mall.I just roam around the mall looking for something that would interest me.  I loved this  store window and the figures standing in it. I loved their trendy clothes. I did several other sketches of figures and their clothing thinking this might be a great painting with maybe a young woman standing outside the store looking in the window.