Hey Marco,
Product photography, especially food is not easy to do and very subjective as to client needs, style etc. But one overriding factor is shape.
The shape of the food, the color and brightness are paramount to effective food photography. Shaping the subjects often requires a very well thought out plan to reduce unwanted reflections, direct the viewers eye toward the sweet spot on the food and create shape. You use light to create all of those.
For example your chutney with the pine nuts. The glass gets lost because there is no direct light falling onto a dark product - on a dark BG. So what you have in essence is a light sucker dead on in the middle of your image. That is the biggest issue what that image. Secondarily you have a huge red box top drawing you eye away from the glass and that box has a spoon running right through the logo on the box. There is no detail to speak of in the greens camera left except for a small amount on top and that is OOF.
So that image for me is a no-go and needs to be reshot and preferably lit with a large source from the front.
In the mixed drink, again you have the top nicely backlit but the sides of the glass have no separation from the BG. It needs reflectors from the sides that do not spill onto the BG to an edge to the lower surfaces of the glass. Also you exposure is way off by at least two stops so that the normal intense red you should see looks like a graduated grey / brown.
In the three glass setup with the hiball the liqued looks dead, no life - nothing that makes me say Gee I wish I had one of those right now. You did use a reflector there - a good start but it needs to surround your subject so that you have even reflections across the gold surface at the rim from one side to the other. And again the exposure is definatly off due to the BG dominating the meter.
It has taken me years to learn how to shoot food and I still am not satisfied so don't get disheartened. It often takes a real good PRO food shooter the better part of a day to get the exact image they and the client want!!
Check out http://www.loumanna.com/
one of the very best food shooters. You may want to pick up his book too "Digital Food Photography".
Cheers and keep trying,