FIRST IMPRESSION... when first looking at the challenge entries for milk, this is not one that jumped out at me. I'm not saying its bad, its just missing an element that would make it stand out from others.
COMPOSITION... pretty standard here. I think what hurts the composition is that lack of a simpler background. A solid black or white background would have worked much better. The pattern on the tablecloth distracts my eyes somewhat. Another possibility to improve its "wow" factor would be the lighting. Its very good lighting as it is, very even, not harsh, no distracting shadows, but it would be nice to have catchlights on the glass or something to give the subject "volume". Another possibility might be to get closer in: see if there's an interesting pattern or composition when close: it might make the ordinary subject look extra-ordinary! I'm aslo thinking maybe the framing could be a more vertical one, sort of an anti-landscape crop. This would enforce the vertical lines of the milk glass. Not entirely sure about this. I wanted to try cropping but I'm at a computer with no photo-editing software! If this framing doesn't look better, perhaps it would work on the same subject but shot at a further distance than this one... ? Experimenting with lots of different angles and view points is key :)...
TECHNIQUE... I sorta covered that above when I spoke of the lighting. Everything is is very well done. Very good depth of field, good overall contrast.
Nice shot although this may have worked better on a different background. A little darker one would have shown the milk better and appeared less grainy.
A plain but well shot setup photo. Interesting that there seem to be about 5 shadows behind that milk glass! The lighting could do with a bit more work, I think... more diffusion to make the shadows softer. I'm not a fan of a big, square crop either... it makes a photo difficult to read, in my opinion.
The lack of lighting on the side of the glass makes the milk look too yellow, like something is wrong with it. It could use a little indirect lighting IMO.