To everyone, thank you for the help!
Now, specifically to @The Chattering Lack of Common Sense
You are right in SO many things, however, I'm dumb and have no idea how to change the design without erasing the intention of the design, you may not have noticed (probably nobody did) but this character is based on the trans flag (this version of the trans flag has no defined gender to fit most experiences), so you are right, I may need to add more colors, however, I'm not sure how to without it looking non-trans, I want to make them easily recognizable as a trans flag character
Their personality is kinda like Rarity from MLP, wanting to look fashionable but is still approachable, as in, they are kind are generous, not mean (most of the time)
Quoting Rarity, they like their clothes to be "Stretchy, but not clingy. Shimmery, but not showy.", and they are kinda like a parent to other character flags, would immediately start a fight if someone was mean to their children, I actually have then in the seventh pose of the second page of poses of Gacha Club, but I uploaded the character in a neutral pose to not cover anything about their design
I wanted to make a different design for the clothes, as I have never seen that kind of clothes, but you are completely right, it's too simple, and I'm very ignorant about aesthetics, that's why I asked what aesthetic it fits to actually change something about it without not looking too different, I'll keep everything in mind, however, I am so scared of what I mentioned before, so, if you can, give me more tips please, thank you