Great designs, both of them! I especially like Frost Lily, but Koala Dreams has a lovely backstory and an adorable symbol.
Both ref sheets also work very well in my opinion, they are clear and visually balanced with just the right amount of information. As someone who has done adopts/commissions of personas before, I generally like colour swatches in ref sheets because they make it easy to pick correct colours. Still, I think Koala Dreams' sheet works perfecly without, it looks so neat and uncluttered! Since the full body image doesn't have any extra shadings or gradients, it would be easy to pick the colours off the pony, too.