It's a good attempt Gary, like the colour combinations with the background. I love beverage photography and it's something I keep meaning to do more of to get better at since checking out robbb grimm and karl taylors stuff. For some inspiration there's a good overview here from a promo for the karl taylor product photography dvd series lighting a whiskey bottle.
View: https://www.youtube.com/watch?v=IIm-SZHKOW4
My critique which may seem a bit negative but isn't intended to put you off as it's a good shot. The highlights down the bottle are a bit sharp, rather than shooting with just the softboxes try to put a scrim between the light close in to the bottle either a big sheet of tracing paper or a large 5 in 1 reflector with the cover removed. The highlights are also a bit thick and far off the edges you want the highlight close in on the edge and fading off ideally to add shape.
The highlight on the neck covers the text, I'd have been tempted to shoot this twice rotating the bottle to get the text centered and composite the two together for this bottle.
The bottle looks a bit dead either a back light or some reflectors would be good to bring some vibrance in to the liquid and make the bottle pop a bit more.
You've got some shadows casting through from the back of the bottle from labels. If you're shooting bottles it's best to remove all the rear labels, the quickect way is with a razor blade or stanley style blade flat against the bottle then a wee bit of sticky stuff remover if you're a perfectionist.
There's some funny shaped light bits, caused by imperfections in the shape of the bottle, you could probably minimize these through meticulous lighting but I'd work on just retouching them out, dust and scratch filters in photoshop ar great for getting small imperfections in bottles. Check phlearn for some good retouching stuff.
keep going with them anyway I love lighting products, wish I had more time for it