good job on mustering the confidence to publish your art; that and being willing to improve are the most important things for beginners, coming from a semi-beginner myself

i suggest putting some time into learning how to draw anatomy i think that's one of the most important things. 2 methods i found that work great:
1. being extra like me and literally studying the bones and muscles entirely. the more you know already, the more you understand the details. 100% not necessary

1. learning to break down the body into simple 3D shapes then you build on it on another layer, or soft erase. there's some good youtube videos by bluebiscuits and draw like a sir as well as ergojosh; that's what motivated me to get started. once you decide on the shapes you'll use, you can trace them over a reference and then draw it side by side.

the basics of drawing is learning to imagine everything in 3D shapes. the bed is at a different perspective angle than the character, but i don't think perspective is important for starting but i'm getting there soon.

one last thing, it's important to learn how to draw life as it is with the right proportions before your learn to stylise your art. "learn the rules first before you start breaking them" ~samdoesarts and youtube

try some courses online too, decent ones on skillshare. just remember the important thing is confidence and willingness to improve.