I think glasses would make for a good prop.
This might be weird, but honestly, a collection of default generic shapes would be kinda useful? Like, if I had a couple organic shapes and basic polygons in the style, I could mock up hairstyles (at least in silhouette) and other arbitrary props/additions, without necessarily having to add much complexity on your end as the artist long-term. Like, for my prototypes, I had a character with two smaller forehead horns, so I resized and duplicated the "unicorn" horn to get something similar. But if I had a vague dorito shape, that would've worked just as well and gotten closer to the look.
I was confused by the purpose of the layers labeled "blush" and "color #13" (the yellow one, in case the name was auto-generated). To my eye, a cloud floating beyond the neck doesn't look like blush. Is that yellow one meant to be for recoloring the character? But it's not in the Base group, so it's just tinting the whole canvas. Granted, I am opening a CSP-exported PSD in GIMP, so maybe something got lost in telephone?