The downloads are in Zip format, and PSD style, for use with photoshop and similiar programs. Alternatively, you can get the renders by cropping from the sample images.
And here are the character arts, which include faces:
Aoi (Girl 1)
- Sample:

- download:
original: Link
translated: Link
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Satuki (Girl 2)
- Sample:

- Download:
original: Link
translated: Link
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Nagare (Boy 1)
- Sample:

- Download:
original: Link
translated: Link
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Kaoru (Boy 2)
- Sample:

- Download:
original: Link
translated: Link
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Information:
Please note, the following is directly from the site, though it has been translated into english.
For use with a:
- "Free distribution" self-made game.
Not for use with:
- "Delivering 18 + and pay" self-made games.
Character names:
- Regardless of what is put here, please feel free to change the name.
Copyright Notice:
- As providers start painting, "Izumi Asuka Izumi pavilion" ; a display of the distribution in public (and in the game and Readme, a place somewhere) to thank you.
In other words, credit goes to "Izumi Asuka Izumi pavilion."
- Please include credit at the end of game, and in read me.
Processing:
- Other changes to the PSD file format from the inversion of images, enlarge, reduce, use some (only "face" and "bust" etc.) is possible.
- Color change or addition can not be drawn. (Change in color tone effects are "not change the color," not true)
From what I understand, here is the final say on color changes:
- [Change] even possible to display the entire material. (see top half of picture below)
- [] No change in parts. (see bottom half of picture below)
An example of showing the correct way to alter the pic is even shown from the site:








