Doraemon Cheese Toast 哆啦A梦／叮当奶酪吐司

This was my first drawing on cheese toast using rice paper. It's actually quite easy to draw as I traced the outline of the Doraemon before colouring. 

The only challenge is the colour. I used natural colour from blue peas flower, charcoal powder and red rice powder. However, the blue colour turned a little purple when contact with cream cheese. I then realised that cream cheese is moderately acidic, therefore the reaction happened. 

Look how the colour changed...