Hi Liz, thanks for popping into my thread. I'm still catching up but couldn't resist peeping in here and you've made a great start to the year.
I like your subject for "Old", they look well worn and probably feel like a pair of old friends. The vice for "Metal" is bang on theme with lovely colour and textures too; it would probably be a great subject from a variety of angles. In fact, you've chosen great subjects for all of your shots!
In "Captive" Jack's eager expression and bright eyes show how keen he is to get out, the colours and details in the circuit board for "Miniature" are fascinating and well captured, and any doggy owner knows the body language in "Happy". As already noted, it looks just a smidge out of focus but still conveys the theme very well.
I'll be following your thread and looking forward to more. Good luck with your 52