I've been waiting for a mother's love image! The way Mom is focused on the child makes this a great choice for the TOM. I also really like your High Key processing although your choice for main IS the best choice for the TOM.
A very nice double portrait, the look speaks books and also how she puts the arms around the child. I like the pp, it reminds me of some b/w images in my family photo album. During kindergarden a photographer came and the parents could purchase the photos ... and so did my parents like probably most would. Another excellent image for the TOM.