>>3229586His right ankle is bent entirely too far, perspective shouldn't be making it look that small either. To see why his torso is wrong, just imagine if Megumin's right leg wasn't there and try to draw in the rest with your head, it's laughably bad.
For Megumin's arm, compare her left arm to her right arm. Or just imagine how long her right arm should be relative to her abdomen (for reference, try putting your right arm down to your side and see where your hand ends up).
The lighting's also shit, but to be fair most people fuck up lighting.
Lighting is also off, but to be fair most people don't get lighting right.