Possible Clues:

• Paint bird and cat without first trace of style
• Paint
• Having been beaten up, the mule is on it
• The mixture of the mule is no mixture
• Mixture of insoluble liquids
• Perhaps milk with muesli made available
• Muse close to Lucian smeared with oil paint
• Mayonnaise, butter or mousse
• Mayo, for instance
• Paint birds catching cat by its head?