This is IMO what's wrong with Tessa's SM.
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This is a sponsored post that's so obviously a sponsored post. She's posing in a "bed" that's obviously in a studio and she looks like she's shooting a commercial. Which she is. But the point of SM is to not seem like a commercial.
As a comparison, this is Katia's post about a sponsor she is (nutrition school):
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This shot seems candid, even though it's for a sponsored post. She brings her own story into the equation and talks about how she struggled with her relationship with food.