Nice glasses. For me, glass is all about reflections and refractions. It has to look right not only on the glass but on the rim and bottom too. If you don't have much to reflect off the glass or much to refract, it's not going to look right. Also if the refractions are slightly off, it can make it look not quite right as well.
Don't be satisfied with what you can do but rather strive to do the things you can't do!