How to create hover to images???????

Hey!
I've been facing an issue that I can't seem to be able to fix with research, so maybe some of you can take a look at my code and help me with this, my website is: http://thenoirportrait.com

When you move your mouse over the image of my first post the image change it's opacity, great! But in the image next to my first home, my "About" image photo it doesn't change, I hover the mouse and nothing happens! It looks so dead Sad :( Sad

This happens too in the section "It's Shopping time", where I have 4 rows with 4 images, they don't hover at all! But the rest of the images yes.

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