Free Syrian Army

The Daily Mail has an article and some pictures of the Free Syrian Army. Here is one of the pictures from the article:

What are some of the things he is doing wrong? Here are a few: (i) He is too close to the window--he could be seen; (ii) he is sticking his barrel out the window (see (i)); (iii) he is not shooting from a stable platform or position;  (iv) he is resting his barrel on the window sill, which will throw off his aim.