Here is a spot with some skinnier men https://www.dreamstime.com/stock-photography-close-up-abdominal-muscles-young-athlete-over-white-background-image36001392
Just be aware that there is clearly some photoshopping going on in those photos, but its not egregious.
Looking at the groups that you drew, you didn't do bad at all. The abs group on number 3 is a little wide on the left side of the page.
On number 2 the oblique groups tend to make a bit more of a curve upward along the bottom.
On all of the models, the abdominal group attaches much lower, at the pubic crest of the pubic bone, this link has a good image and is in general an awesome site for illustration of all of the attachment points of the muscles. https://www.getbodysmart.com/abdomen-muscles/rectus-abdominis-muscle
I hope this helps, keep at it!