Mother's day is getting closer here in Finland, and i was wondering if there is anything i should try to improve in this picture:
http://www.saunalahti.fi/~ollire/mother.jpg (picture of my mother) :)

And i was thinking about printing this in A3 size. (original .tiff is of course much bigger)

amazing job.....i wouldn't change a thing

If your intent was restoration only, stop. The restoration work is excellent, much better than I could ever hope to do myself. My compliments.

Consider the changes I made as food for thought that in my opinion make the final result a little more interesting:
* Crop and rotate using Crop tool. Cropped to eliminate the distracting pole on the left and remove some of the foreground grassy area. Rotated CW a few degrees to make the side of the building parallel to the right edge.
* Lighten right side of her face just a little to open up shadow areas around eyes.
* Spliced in some clouds to give the sky a little interest.

Indeed you did a very good restoration work.
My only concern would be the very white sky that you could tone it down.

* Crop and rotate using Crop tool. Cropped to eliminate the distracting pole on the left and remove some of the foreground grassy area. Rotated CW a few degrees to make the side of the building parallel to the right edge.
* Lighten right side of her face just a little to open up shadow areas around eyes.
* Spliced in some clouds to give the sky a little interest.

Thanks for your suggestions.

Adding clouds surely make this picture more interesting, and I'm gonna try adding them later. I think i'm gonna print this as it is now, and later try to make a totally new "spiced" version.