Good free drawing and image editing app?

[lectraplayer]

I'm looking for a good image editing app that is great for drawings. A zoom is one function I need that I'm not finding. Beyond that, I mostly need a multi-layer editor I can draw in. I want something like GIMP for Linux. A free, ad supported version would be best.

 

[lunatic59]

SketchBook Mobile Express

 

[Ricky Babalu]

Like Lunatic recommended above Sketchbook Mobile.
You might also be interested in Sketchup, I have been playing around with it and is a really neat 3D program.
http://www.sketchup.com/

 

[lectraplayer]

So far no load/save function on Sketchbook. What a showstopper. I had a good app at one time but can't find it now. Maybe I have a backup copy. If needed, I can do without layers temporarily and use GIMP at home. I need a load/save function so I can do my drawings a little here and there. Seems like a good paint/image editor hybrid wouldn't be too much to ask. Maybe the FUBU environment of Linux has me spoiled.