The Polaroid-like sound you hear once the photography is taken, means the automatic aligment took place.
If you did not hear the sound, it means the black frame around the image has not been detected. If you are not satisfied with the alignment you have, you should take another photography, and take care to have the whole black frame in the image. You may check also some part of it is not hidden by a pencil or by some coloring.
Note that even with no automatic detection, Wakatoon will let you see the result. Some users have fun taking photographs of anything and watch the psychedelic results.