I have to say, I agree with the suggestions made in Johnny's post to try an spice up your tags or wallpapers!
Your art is good and it also holds a lot of possibilities for improvement or open gateways to different styles to explore. I really dig the circle icons/avatars. I like all of them except for the square one only because it's made well but comparing to the other icons it's not as fun to look at.


These right here are great. I love the flower image coming out of the circle border. It's fun, it's pretty, it has texture, it's great to look at! For the second one, I think you have a nice palette and interesting background.
I think an issue that comes up that LITERALLY tons of people have when making tags it: use of text. Those are just some major things in your tags I'd look out for. Try less text and smaller font? Either or could work. There are tags that have BIG text but it's only maybe one or two words? A lot of text can really make a tag look cluttered, and I think your strongest pieces have no text. If you want to try working on text, try something smaller - like a name!
I agree with Johnny on studying the render and thinking of it's action because you can pretty much dictate where a viewer's eyes will travel on the piece. Johnny suggested layer masks so I'll suggest: you can use the pen tool or smudge tool (both are in PS and Gimp but gimp is free) for different effects that could help set a direction to go along with your render. If you want some tutorial links or suggestion with a future piece, hit me up on discord or PM me here!
Your work is good - if you need help you can talk to anyone here, and also keep an eye out for designs and art that inspire you. It might be something you'd like you add to your work! Keep on creating. c: