Hey, everyone starts somewhere! It's good that you're humble about it and want to update your mod further to improve it - that's a great attitude to have in general. So for criticism, I'll mostly fixate on things to fix that would improve the experience.
1) Tiny detail but it goes a long way, but I can't change colors in multiplayer. It's not a hard thing to fix, there's two ways you can go about it. Coloring him green (Check the wiki's palette for reference!) will let you recolor him however you'd like in multiplayer (SLADE has a color remap tool that straight up lets you change the colors of ALL sprites by another one, its very useful!). The other is changing the startcolor = 96 section in the S_SKIN. 96 is for green, which you'll notice is how most characters are colored with in most addons (Even vanilla!).
2) I found a few of these sprites pretty amusing, like the RIDE sprites being quite the surprise. You should play more with that! It's a shame that most of the time you'll be seeing the same sprites over and over again, and it'd be nice to see some of that creativity sprinkled over many more poses.
3) While yeah, Lua can be a scary thing, you don't exactly need to learn how to code - in the MB there's plenty reusable Lua addons that you can add to your character, it's as easy as looking through the Lua file and making sure the targeted player is your character's skin name. You can get help with that either in these forums or on the official discord. There's plenty of help there.
Most importantly keep that humble attitude of wanting to improve and listening to feedback. As I said before we all start somewhere and you don't have to be ashamed of not knowing what to do.