I use primarily Sketchbook Pro ($4.99 on Google Play), LayerPaint ($2.99), and Photoshop Touch (came with my tablet, normally $9.99) on my 10-inch android tablet (Samsung Galaxy Note 10.1). They all recognize/use the Wacom pressure-sensitive stylus of the Note 10.1 and support layers (# depends on the resolution of the image created, I tend to work with a max of 4 and merge as I finalize changes). Sketchbook Pro has the best brushes and UI, whereas LayerPaint allows you to do color blending/mixing a la Painter/Paint Tool SAI.
You can get a free version of Sketchbook (Sketchbook Mobile) to try it out first, the Pro version just adds more features that IMO make it worth it.
Sample (unfinished) using entirely Sketchbook Pro attached (sketch of Flaming June figure by Leighton I did while looking at art books at the local public library
With regards to similarity to Artrage (which I also own, graphics programs are like candy to me), the UI is significantly different.
Update: I checked Artrage forums and the company has stated it's working on an android app (last update September of last year, so no news yet on release)
It looks like something similar called InfinitePainter is now on Google Play that people have said feels/looks similar to Artrage - play.google.com/store/apps/details?id=com.brakefield.painterfull&hl=en
I have not tried it and YMMV (though I'll probably buy it since the reviews are good and now I'm curious)