I had a client meeting with Owen today from Sonic machines and he looked at the designs I've come up with and he is really happy with them.
He liked the one which had a balance between the constellation and image of the object both being equally prominent. He thinks you need to strike a balance between the two.
He likes both the white line and the black line lines for the constellation pattern. He likes the faded lack on the metronome but the darker shade of purple looks better on the washing machine image. He is happy for me to create 3 more for each icon.