Better outline. It could improve more if it had its own highlights. Which you'd notice at once if you had that glass in front of you! Nothing will ever top drawing from life, and it's great fun too.

Banding is explained in the link; it's those similar parallel segment stacks (in all your ellipses) which the eye views as large rectangles ('reducing apparent resolution' as Helm explains): they must be broken. You can do that during AA, although it's better if they're never there in the first place.

Be sure to always check your pieces at 200% (or 100% for really large pieces, or avs), it's the scale at which both local and overall effects are apparent. If your software allows, open 2 windows for the piece, one at 200% and one large to work on.

 So is banding a shape issue or an AA issue?  This is quite a large piece so banding must be an experience issue for me.  I tend to find reference images online and most of the time I do the big no no... instead of interpreting a photograph I focus on other artists styles and try to find out what their solutions were... for this piece I actually had no reference but it would have taken 2 seconds to pour a glass of orange juice and probably improved the overall quality of the art.  I was thinking of a lighter outline, it seems better but perhaps not quite right still...

 The colors did take a while to choose but the theme of the challenge was fruit.  I was going to do orange slices to the right of the glass but I lost ambition and I really really really want time to do an entry for the sslimy challenge too!

 Like AA kind of work or the shape isn't ideal?

Ambitious piece! Transparency + realistic shading = difficult.

Did you work from life (best)? From a picture? It looks like flash photography, with a brightness gradient from front to back and cast shadow close to the object. Not the best of lights for a reference, but you made well from it.

Main issues: you should totally remove the black outline, it's inconsistent with realistic shading. The glass should probably have curved bottom edges; and the cast shadow should disappear beneath on the left side. And there is some banding.

seems fast made on me.....like mortar said could use some work....and also it seems to have no intresting theme

but the palette is cool !

 the top and bottom of the glass could use some work, but other than that I actually really like it! It's got a certain.. I don't even know, but there's something fancy about this and whatever it is, I like it.