for sugar you could do one of 3 things...
first make a single ground sugar peice and simply array it (which would put the scene upoto the millions)
second is make a solid object and give the texture a displacement, bump and refraction of sugar
third is similar to the first only using particles instead of objects.
as for the milk and coffee itself, look online at coffee and milk sites from people like Cravendale and Kenco; they'll give you a better idea of what the liquids should look like.
And use Metaballs/Metashapes instead, they act far more like liquid.
as for the cups, saucer and such... not to bad for first hi poly but quite obviously nurbed; setup smoothing groups and then renurb them with those smooth groups in mind. it makes a world of difference.
i'll see if i can't make and upload an example

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