I love your inventive angle here, it really highlights the difference between the oil and water. I'd like to see a little higher contrast or truer whites for the background but the translucence of the glass is very nice as is the highlight along the edge of the oil.
I wish you had hit the oil with more light to really make it glow, either from behind or above to keep highlights off the glass. The composition is interesting but the colors need to be as bold as your framing.
in a wineglass?....nice. good lighting and focus. Would interesting to see the oil/water interface running vertical....my head keeps wanting to tilt 45deg one way or the other. But maybe that's the point! ;)
I see your idea here....but it's not clearly seen. I do think the flash/and background lights are a bit of a distraction to your shot. Good luck in the challenge.