well they look kinda cool but i don't think i would use them. the semi transparent grey seems unnecesary and some lines seem thicker than others, also they could look better if they were a little smaller inside the circle right now they seem a little big imho specially the first two rows.
One of the best things you can do as an aspiring designer is never use a mockup to judge your work. Look at it as you made it. Mockups make it feel better, more real. You need to look at your things as they are and you'll know yourself if you should be proud of what you've made or not.
What you've got here is nothing special. It's great to do the work to sets and icons that match each other. Don't ever stop designing, but also take the time to look at your stuff without filters, mockups, or effects and you'll start to really get a feel for what it actually looks like.