I've noticed that you registered here last month : welcome !
I like this place very much and I hope you'll find here nice people and good advices/tips.
Still few photos in your portfolio , baby_girl.jpg is really nice ! Great work of edition !
Back to your challenge entry , the idea was good but maybe not for a Rhythm challenge (description : Repeat a theme to create rhythm in your photograph) , the "waves" of the cola created a too subtle rhythm , there are too many bright reflections and those highlights are a bit disturbing.Another point is the focus , the main subject is blurry , focus seems to be centered only on the rim.
I don't know what was your goal with this photo , maybe without the rim , in a bigger container , it would have appeared more abstract.
I have had a look at your web site , I'm sure that soon I'll see your entries in the top 20 (at least).
Please feel free to email me about this critique.
(I'm an amateur and this is only my opinion.)
Well the capture of the liquid in movement does add to the Rythm aspect but the focus is on the rim which is hardly the focal point of this photo and the overall composition doesn't seem to work very well.
The overall concept is something to think about, not sure how I would've shot it. It's a thinker :)