I love the colorful turbulences in that jar, and I have a few suggestions for improvements:
1) Pay attention to your background. Seeing that crooked line is way too distracting. If you sat the jar on a large piece of paper or cardboard, then extend it upwards behind the subject, you would have a flawless, seamless background.
2)Play with some adjustments (like curves) so the white actually looks white and the colors look their best, too.
3) Minimize reflections by very careful lighting, the use of a circular polarizer (filter), placement of camera vs glass, and possibly by holding up something black in front of the glass - close to it, but just out of view.
4) Some extra props might liven up the composition.
The natural beauty of the ink patterns is really quite hypnotic. The pink ones at the top of this concoction work really well but soon mesh into a horrible looking mess towards the bottom of the tank. This is where your image loses some of its appeal, particularly at the very bottom of the tank where it even turns to green. It leaves me a bit uncomforatble in terms of your subject matter.
I think a closer crop of the top of the tank would have worked better, it would also mean you cut out the line in the background where your worktop meets your wall which I find somewhat distracting. Certainly an interesting attempt though, a 6 from me.
I like the colours and the mixed effect, very much chemistry to me.
The unfortunate downside is the reflection.
I submitted a picture some time ago which had beads in a glass jar, very similar to the one you used, and to be honest I didn't, and still don't, know how to get rid of a reflective glass surface (other that to crop out such surfaces)...
I have a feeling that taking the picture from an angle from above would decrease the reflection, but i'm not sure if that is true.
I think i'd do the same here and just crop to the top section, then it would be a great picture!
If you find out from someone in a comment about decreasing reflections, i'd appreciate some info on this. Good luck, :-)
another way to light fluid filled glass is to set it on top of a soft box. I take a plexi glass sheet and put it on top of the soft box. This helps to eliminate the glare in the glass as you have here.