First try of technique and on brown cardboard

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I really enjoyed this class and this technique. However, I realized my material has some weakness: with this cardboard, I couldn't make the colour pencils shine that much, and my white pastel didn't want to write over the colour pencils... Can you help me with that, if I don't have Zentangle tiles? What can I use as substitute? Thank you so much for those zen times!First try of technique and on brown cardboard - image 1 - student project