I've just listed a new ACEO diptych in my DaWanda shop. It looks like this:
and is for sale here.
It's a mini version of a favourite composition of mine, which I've used here and here. It depicts a tree spreading across two cards. The first card shows one side of this tree in daylight, and the other shows the other side of the tree at sunset. The tree on the daylight side has been painted using a mixture of copper poster paint and black acrylic, giving it a metallic sheen that looks different in varying light. The sunset tree is in silhouette, painted in black acrylic, a striking contrast to the bright acrylic colours of the setting sun. As I believe is standard with ACEOs (I did say these were my first!), both of my cards measure 6.5cm (2.5") by 9cm (3.5").
I've also painted a circular art card, on display here: