Hello!
It's great to see that you're trying hard to improve that drawing and that you're adding muscles and so on
The issue I see is that the legs are not on the same perspective as the rest of the body. It's like they are looked from above except that the body not really is at the same angle. At the moment, in your drawing, it's like the legs are going through the ground.
I also liked better how you did the arm at our right before. It's not really common to bend your arm like that since your weight will be on that arm
I used a free 3D program to create the pose on the left, thinking it would help you. But after second thoughts I decided to draw my version of your character pose, thinking it may help to see how you can proceed with the ribcage and hips parts. Please note that the bottom of the ribcage is where the elbows are when the arms are stretched (that tips can allow you to quickly check your proportions

)
EDIT : also before I forget again, the arms in that kind of pose are partly hidden by the body, especially by the ribcage. In your drawing, you seemed to have tried to make them entirely visible, so it can be a good thing to think of (what is before what, what is hidden by what)