I thought the distortion in the reflection was deliberate LOL!.
Well if you want to get a more natural reflection, even the tilted silhouette of the cup will work here I think. To use the shape of the cup reflection and keep the detail, just redraw the fill; take out the top ellipse (the part of the view looking into the top of the cup) redraw/reverse the curve of the coffee itself to match the new rim and extend the side reflections up to the rim.
Proper perspective would need a completely redrawn reflection, but that may not be necessary. distortion can be stylish if it looks deliberate. You could try and fade the reflection out or just fade the details out, before it gets to the worst 'offending' parts.
Sorry for the 'roughness' of the retouch here, not much time, but you can see what I'm getting at I hope?
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