I made a worksheet using popular masterpieces to help younger students talk about their aesthetic responses to artwork.
Attached is my Feelings in Art worksheet. Have students look at the subject matter, body language, and colors to help gauge how a work of art makes them feel. There are no right or wrong answers, and it is interesting how students interpret different things. I hope it starts a lively discussion for your class.
I apologize for not including my resources and for the fact that the worksheet itself isn't the most aesthetically pleasing! Hopefully you will find it useful in your artroom.