Hey there! Well done. I don't know the character, in fact, I don't know the anime haha. It seems good tho :D So, The proportions are off. I’ve drawn over your sketch, pointing out the proportion issues and some general mistakes. Remember that anatomical landmarks exist, and you can use them as guides to draw more accurate and proportional figures. Proko has a great YouTube video covering anatomical landmarks. Another method that has helped me personally is the rule of thirds. Divide the torso into three sections, measuring from the top of the head down to the bottom of the pelvis. The first third goes from the head to the base of the neck or collarbone. The second third goes from the neck to the ribcage. The final third covers the remaining abdomen and pelvis. The deltoids span the length of the pectorals, the elbows usually align around the navel area, and the hands fall around the glutes. Keeping these relationships in mind will help you avoid drawing arms that are too short. Also, start by building a mannequin using simple forms like boxes and cylinders. This will help you focus on proportion and perspective first. Once the structure is solid, you can gradually add complexity. I hope this helps!
