Unfortunately Lena is railroaded into posing there anyway because Seymour made the Gallery guy stop working with her. However, it happens off-screen either in Ch 10 or Ch 11 prologue, Lena just casually says "I also started posing at the cafe", not really taking into account her attitude towards Ed being pervy. I remember in the early chapters she was very serious about keeping her modeling separate from her day job, but looks like Eva forgot about it and made Lena change her mind after the one time where he visited her at the gallery. Not to mention the plot hole where Lena could keep her modeling a total secret from both Ed and Molly, thus preventing Ed from perving on her Peoplegram. Which makes me wonder: How was Ed able to stalk Lena's Peoplegram and learn about the life drawing if she didn't tell him about being a nude model in the first place? And funnily enough, Lena never acts surprised after he says he just saw the announcement on her Peoplegram and she just shrugs it off and continues with the day instead of calling him out on being a creepy stalker and sending him away (or at least promising to have a follow-up talk at work).