Why does her chest look pasted onto her body?
Usually the ribcage underneath has no depth, so the breast shapes have nowhere to attach. Build a rounded ribcage first, then place the chest on it.
Our free guide walks through five stages: ribcage volume, placement, three-quarter and side views, waist shape, and bend and twist. Each diagram comes with a red-pen check from Japanese pros.
Save this for your next full-body OC sketch.
Read the free guide:
https://animeartacademy.com/p/how-to-draw-anime-breasts-waist