Hi Baruna, I think the inner outline of her right deltoid is a little off. It shouldn't meet the middle of the collar bone. That's what distracts me and I hope I am helpful. Cool drawing by the way. (I would think her hand is a little small, but that's just a guess, I don't have a clue how to measure or relate the size)

Okay Baruna, I did a sketch over your drawing and added some notes that I hope will help you. This is besides what @Rick B already told you about line weights.

Line weights are really important. use thicker on the outline. thinner on the detail. also the muscles on her are too defined. use small crosshatching to imply the shape of the muscle. on women the Vein on the bicep is always omitted. in drawing for women muscles ripped and striations are less. IF you still want her ripped and muscular. use shading instead of lines it still will make her look power full but not masculine. I don't know if I am explaining this correctly. Here are a couple examples