hello friends.

i have recently started baking so i am not an expert and lot of things come in my mind while baking and decorating. i am making a Lady Bug cake for my daughter's 2nd birthday. i am making a whipping cream cake as my family and friends doesn't like fondant and fondant setting. i have decided to use orea biscuits for ladybug spots. while doing birthday preparation i decided to make royal icing biscuits too. so from there i came up with an idea that what if i cover my orea biscuits with balck royal icing. and place it on my red whipping cream cake. will it stay fine or there are any chances that it will spoil the whole cake or il melt in it? advices ..help friends :)