Hey there Actinidia!
Really great stuff. I have a few notes that I thought could help improve it…
red :: There needs to be some sort of shadowing or a dip in the liquid or something at this intersection point between the cookie and the liquid. I would start with just a very subtle, soft shadow like an occlusion and see where that gets you.
magenta :: the highlights on the rim appear to be clamped just a bit. this might just be the jpg you needed to upload to this site, but make sure they are reaching full white levels and not topping off at gray, clamped level.
yellow :: it’s hard to tell if it is the material on the table, but it is reading to me as caustic passing through the glass. if that is the case, i would eliminate that because the liquid in the glass is so thick it wouldn’t allow light to pass through like that. that being said, i would consider adding a touch of the liquid’s color to the table as if there was some transmittance happening.
green :: i would try creating a very subtle, very soft vignette on this shot in your post processing. This will keep the viewer’s eye more on the main subject matter in the center of the image.
Let me know if you have questions.
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Co-Author :: Lighting for Animation :: www.lightingforanimation.com