Book cover concept: A highly realistic and almost 3D quality image depicting the

Book cover concept: A highly realistic and almost 3D quality image depicting the physical transformation of a woman from obesity to a slim, fit, and happy version of herself. On the left side, the woman is overweight, with a somber expression, wearing casual, loose clothing. On the right side, she appears slim, fit, and radiantly happy, wearing form-fitting athletic wear, with a confident and joyful smile. The background should transition smoothly from dark and muted tones on the left to bright and vibrant colors on the right, symbolizing the positive change in her life. Ensure the cover is ultra-high-definition 4K quality with a hyper-realistic style, capturing every detail of the transformation.