This first came to my mind when I read about the challenge. We all face the issue of drinking cokes every day versus milk. This is a very important choice we must make in life... Science shows that for every coke you drink, you must drink a glass of milk to make up for the calcium loss.
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When I critique a shot, I first look at the photo without the title or other information and try to figure out which challenge it was from.
This one was easy to figure out, so you have the connection to the challenge, although I don't think it's a particularly original one.
Technically, I think you've done okay here. The colors and lighting seem a bit flat to me, but not too bad by any means. The focus seems good and the image is clear.
For me, what disappoints in the photo is the subject and composition. A can of coke and a glass of milk next to each other just don't hold my interest, even though it does meet the challenge. They are just placed side by side in a mostly centered composition that adds no interest to an already so-so subject matter, in my opinion.
It is very difficult to come up with ways to make a photo carry some sort of "wow" factor - and maybe for some folks this has it, but not for me. I'm not sure how I would improve it. Maybe if the glass and can were on either side of a balance scale or something like that to add interest. I would say to keep trying though and I hope these comments have been helpful.
Nice shot with nice angle and good concept. Well placed objects next to each other, almost creating a leading line effect. The lighting is okay - perhaps a bit brighter would have added some more "white" to the milk (but that's just my take).
People cannot find original idea anymore.... way too much Good-Bad food and pepsi-coke picture.... for me even if the picture is OK, having 10 of the make all of the 1, sorry !