Hi!
I decided to contribute to your draw thread with a red-line to help you out a little. I'm not an expert tho (´人｀)

I kept the head side the same size.
Adjusted the pose to be more natural.
Shortened the legs, made the hands more proportional
adjusted eyes, thickness of torso, curves

things to keep in mind:
1. just because lolis are small, doesnt mean they have tiny hands relative to their own body, their hands and feet are normal proportion compared to the rest of them. They just seem small to you because youre a big person! ヽ(´∇`)ノ

2. Lolis have tummy curves! Even muscular ones! Lolis can be curvy just in different ways that adults! Keep that in mind when drawing child characters. If you draw adult hips and abs on a loli it tends to just look off. （⌒∇⌒ゞ） I made her flat and younger because thats teh awesome! LOL
when you draw stuff like arms and legs dialing down the definition helps make them look more moe but also younger in general, you can see this with many other artists.
Making appealing characters is a balancing act between including realistic anatomy for sexy purposes and also simplifying, this stuff takes years to perfect, its something everyone is always workin' on (;´Д`)