Here's a practice piece that I did -- a copy of the Witches' Rune that will be going into my BOS
This is after I inked the outline, applied the gold leaf (this process takes a long time because the glue for the gold leaf takes time to dry), and did the calligraphy:

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After applying the first layer of gouache paint (ultramarine blue & spectrum red):

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The final result, after the whitework (fine lines and details in white gouache) was applied:

Materials: composite gold leaf, multi-medium archival paper, gouache, Higgins Eternal ink, & Higgins Black Magic waterproof ink
There's a big splotch in the lower right corner where I accidentally brushed some of the glue, and tried to cover it up with some white gouache. Not great, but hey, for my first full scroll all by my lonesome and something that's going to live in my personal BoS, I am pretty happy with the result!