Regarding the character sprites and face images you see in the sample images, these were created in advance specifically for the sample images and are considered as temporary or placeholder images. Other than what you see in the sample images, we haven't prepared additional character sprites or face images yet. Particularly, character sprites may undergo some subtle stylistic changes.
The collection of character sprites and face images is scheduled to be developed after the completion of the current work on monster sprites and face images.
As for the monster overview image, I created it for personal use, primarily to compare sizes and colors in the side view. There's only one color pattern, but feel free to use it as a reference if you find it helpful.