
from Yahoo Photos
from left to right
Open question: all of these buttons look alike, yet the activities range from instantly changing your picture to opening new tools. Is this an issue?
Undo is a bit dismaying: one can only start over, one can't undo a single action. So if one is down a repair path and makes a misstep, you have to return to ground zero.
The exception is effects and borders, which have their own undo. Oh, and autofix, whatever the mysterious rules are around that.
Despite these issues, it's fairly easy to get to and use (though why it's labeled enhance image instead of edit image is a mystery to me). Which is why I asked about mixing mode buttons and action buttons, which i would guess would be bad for setting expectations in the user.