#2 I don't think this needed an observer, or if you do have one, I suggest they sit on something with a different colour to the milk - perhaps a Brazil nut in its shell.
I see primarily insufficient Depth of Field (DoF) here (shot at f/7.1), but a lower camera angle may help too.
#3 Great little cameo scene, again spoiled (somewhat) by insufficient DoF; shot at f/8
#3 is my favourite
If you re-shoot - and I hope you do, please don't just 'snap' them;
If the lack of light warrants, shoot with a tripod
Either focus stack or use a smaller aperture to increase DoF
Shoot them on a non-textured and non-patterned surface, I find the wood grain very distracting
Cheers, Dave