Not bad, but I'm not really a fan of the three new ones.
In the first one, you really should have cleaned/dusted off the headphones and the case. It may have been intentional, but the first thing I noticed when I opened up the picture was the dirty case and it lessens the appeal of the photo. There's also a yellowish-orange color cast, which can be easily fixed.
In the second one, the red statue/figure on top of the amp seems misplaced and throws off the image for me. There's also a color cast on this one, which you can clearly see on the metal part of the speaker, since it looks orange instead of gray or silver. If you don't already know how, you can fix this pretty quickly by going to Levels and then using the eye dropper tools. I also would have maybe tried leveling it more, but that's just personal taste. You may want to experiment with it though to see which version you like better.
I like the third one better, but it is a bit too centered. Other than the green patch in the top left corner, there isn't much going on with the rule of thirds. Again, there's a color cast. I would have probably tried to bring more focus to the eyes by increasing it's saturation and then maybe slightly decreasing the saturation of everything else.
Keep posting your stuff though. It's good to see more photography threads (or just threads in the art section in general lol)