I'm not making a joke here. English is not my 1st language and that's why I'm asking how to take it down a notch in this situation.

The context is, this girl is a model. And I went through her Instagram photos and I'd like to say something like the following, but I'd like to take it down a notch a little.

"It looks like you used to be thicc, Did your modeling agency ask you to be slim?"

I know the use of word "thicc" here is highly inappropriate if the person I'm talking to is the girl I met 3 days ago for the first time. So what is a polite euphemism for this sentence above?