When comparing MyPaint vs sK1, the Slant community recommends MyPaint for most people. In the question“What is the best open-source drawing software for Android?” MyPaint is ranked 4th while sK1 is ranked 7th. The most important reason people chose MyPaint is:
MyPaint mostly consists of the canvas. The interface to select different brushes can be brought up if needed, but it generally stays out of the way of getting things done.
Specs
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Pros
Pro Interface gets out of the way
MyPaint mostly consists of the canvas. The interface to select different brushes can be brought up if needed, but it generally stays out of the way of getting things done.
Pro Good support for pressure sensitive graphics tablets
MyPaint was designed specifically with pressure sensitive graphics tablets in mind.
Pro Good media emulation
Pro Forgo the need to resize the canvas
If a user needs a bigger canvas all they need to do is zoom out instead of re-sizing.
Pro Corel Draw compatible
sK1 tries to look and feel like Corel Draw, it has also an excellent *.cdr importer.
Pro Cross-platform
Its written in the cross-platform WxWidgets toolkit.
Pro Open-Source
Released under the GNU Lesser General Public License.
Pro CMYK colorspace support
CMYK support is one of its main features.
Pro Under GNU LGPL
So you don't have to fear the harsh copyleft of the GNU GPL license.
Cons
Con Is not stable at all
I could not even open a png file to start without the software to freeze.
Con Not a lot in terms of image manipulation
MyPaint focuses only on drawing. It has very little in terms of post processing or image manipulation features.