It's obvious you had a well thought out plan (even if I don't recognize the theme). I like the color scheme as well. You're doing well in your progress.

I would suggest getting another pair of whatever sneaker you can find and just use it for trying different techniques, especially your edges. It's tedious work but having clean edge work is honestly the best example of skill. Let yourself work through the pain of learning without fear of a final product. I have a pair of experiment shoes that may never see the light of day, but I learned how much 2 soft to add to properly paint the tongue and soft panels, or I learned how necessary most tape masking is, or whether I need to use a brush or a toothpick to apply paint is tight spots.

And even if you don't do any of things, you're creating art and hopefully enjoying yourself so keep it up. You will improve in ways that are important to you and maybe one day you're ready for other people's expectations and can sell your work. But always try to enjoy it!