A lot of these are poorly done, and look like they were done lazily to me.
While most of them are very simple, and minimalist, you have some decent one's thrown in there.
Try to not sharpen as much, as about all the tags' focal points are completely oversharpened.
Also, a lot of these look like they just have a render copied onto a C4D spammed background. There are little to no effects going on in most of them, and there's no depth.
I'd also suggest leaving text out of published tags until you get good with them. The text you're using has just ruined like 5 of these tags. Keep practicing with it until you think it looks good, and make sure it fits the theme of the tag. Then find a place it looks good, and isn't just crammed into some little space.
Finally, work on your lighting, as there really isn't any in all the re-colored tags of your's.