Pixia.

Pixia is the English version of a popular Japanese painting and retouch software for full color graphics. It supports mask, layer and many other editing functions. You can use your own customized brush tips and even use an image file as a brush tip to create unique effects. Its user-friendly interface is suitable for beginners as well as experts. Pixia supports the most common editing techniques and presents a user friendly interface.
http://www.ne.jp/asahi/mighty/knight/

Grand Dad

Pixia English Edition ver. 4.3d

The new version fixed a bug which caused program errors and/or corruption the previous version suffered on some system environments.

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Pixia English Edition ver. 4.3y!
(Dated Sept 27, 2009)

Pixia ver. 4 and this installer are compatible with Windows Vista and 7..

" Now this new version is compatible with Windows 7. It features improved brush strokes with pressure sensitive pen tablets, and fixed errors and/or crashes the previous version suffered on some system environments.
It is also compatible with the new functions that the newly coming Wacom Bamboo Multi-Touch tablet"

Notes: Pixia ver. 4 does not support Windows 95 / 98 / NT 4.0 / Me. Use it on Windows 2000 /
XP / Vista / 7. For people who have problems using ver. 4, the Download page still supplies some
older versions.

Note: Since some files have been replaced and newly added, we recommend you uninstall the old version before you install 4.3y.

Other language editions will not be updated soon due to extremely busy situation of the author.

http://www.ne.jp/asahi/mighty/knight/index.html