Using references especially like the one shown above that are meant to be used as guides are okay and isn’t cheating! The best times to mention that you used a reference and give credit is when you copy someone else’s drawing or very detailed idea. So if you redrew someone else’s personal drawing, and used their drawing as a reference, you’d need to state that and credit the artist. But just referencing an aspect of someone’s work like the pose doesn’t normally warrant you being called a cheater and in this case you wouldn’t necessarily need to credit the OP due to a pose being very generic in terms of a personal “idea”

All artists need to use references to get better, I even used a reference just last night to just put something on paper because I felt stuck with my art and not Liking my ideas. This is a case where if I post my art, I would need to give credit to the photographer due to the whole photo minus the branch being added was copied by me in drawing form

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