i'm not totally sure what you question is, but hopefully this answers it...and i'll post some examples of pictures (the striper isn't SA size but was used for a
www.onlinefishingtournament.com contest and you can see what i mean by bumping the nose and ruler against a straight edge)
i've been doing online cpr contests based on a quick measurement picture for a few years and this is how i've been doing the skillful angler pics and it has been fine. either lay a long enough ruler or measuring tape or bumper board down and put the fish next to it (or on it if it's a bumper board) line up the nose by bumping it on a straight edge if you can, it'll be more accurate. You can use a little tackle box if you're shore fishing.
9/10 times the fish will lay still for a few seconds so as long as you're ready to take the pic and then do a quick selfie or whatever. as long as you're quick it's fine. sometimes the fish won't cooperate and if you're alone it's tough, but i still think if you're careful and prepared they fish will be fine. If you're concerned about laying it on a dirt or leaves that may wipe mucus off their skin, bring a material that you can fold up when not using and wet it then lay the fish on to measure.
I don't think they're very strict about the measurements as long as it's clear they can see you're not lying. that was the problem guys were highly exaggerating their catch sizes...not really sure why, there are no prizes haha. The program helps F&G see how certain waters are doing and what's being caught versus what they are stocking.
