I certainly do like this image.
If you still want Io to orbit Jupiter, just rotate Jupiter around the 
viewing-axis (z-axis more or less) until they are aligned again :-)
However, that might introduce a strange effect.
I am not sure about the penknife. I think that needs further modelling, in 
the line of some of the other comments perhaps. It needs something dramatic, 
especially as it is in the foreground.

Thomas

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