Hoo mama. Those are some massive curves. Not judging your body preferences btw, you draw what you like.
Though, ironically enough despite these massive assets, it kinda looks a little flat. I think part of it might be because the shading. Maybe the anatomy. Possibly the posing.
The colours, linework, and the lettering looks good. It's just to me it's missing a little something to make it go from good to great.