Hi, Charlene, and welcome both to Ephotozine, and the Critique Gallery.
This is where you can get constructive comments on your pictures, instead of votes or awards: if you've ended up here by accident, make sure that you don't tick the box marked 'Critique' when choosing the options for uploading.
My experience - now 30 years ago - is that you should concentrate, first and foremost, on getting pictures of the most wonderful children in the world, and not worry about technical and artistic perfection until you've done that. I wish I'd been more of a Dad and not worried so much about taking good pictures.
Which is not to say that you can't achieve both ends.
This is lovely, anyway - from both points of view.
Really shallow depth of field (Aperture priority is the right choice) works, although you always risk not getting the right parts perfectly sharp. (I might have upped the ISO, stopped down slightly, and increased the shutter speed a bit, but your results justify the settings!)
Compositionally, the eyes are right on the top left third, and it makes for a really engaging shot. I am completely unworried about the cut-off head, or the landscape framing. I'd have done the same (I hope!) I really see no scope for improvement.
Did you shoot in the Sony B/W mode, or convert later? And have you done any processing other than things like Levels and a little sharpening? It would be helpful to know, in case there are points there to pick up... (I find the Sony built-in mono and sepia work well, though other makes may benefit from conversion later, in editing.)
I've done a mod, which you can see by clicking the 'Modifications' tab below you shot, on the left: then click on the thumbnail. I've used Levels to brighten things even further (the histogram showed a little gap at the top end), and cropped a fraction more on the left: trivial stuff, by comparison with the innate excellence of the shot.
A final thought: back it up. Back it up now. And get prints for every doting relative you can think of.
I look forward to seeing more pictures soon!