And then there is Preview, with which you can flip images horizontally and vertically.
No need for Photoshop, or even the free Gimp.
Btw, to quote several posts, use the
button (multi-quote).
To edit your posts, use the
button.
All these buttons are on the bottom right of the posts.
Minor Problems
6. Sequential posts.
Combine your comments into one post rather than making many consecutive posts to a thread within a short period of time.