yeah.. nah. don't try to teach your grandmother to suck eggs.
If you haven't been a (at least moderately) successful model, keep your advice to yourself. I am embarrassed to say that in my very early days I tried to advise a new model who made me a knight, and in hindsight I was an absolute idiot! (albeit genuinely well-intentioned)
Unless a model asks for my opinion (not my advice -- a subtle difference) I would rarely offer it. And actually I would only offer an observation to my friend for whom I knight and who I have known for some years now. But it is NEVER advice. I offer an opinion / observation, she reads it, takes it on board or ignores as she sees fit, and we move on to discussing or sharing the next example of decadently tasty but bad for you food; how stupidly difficult we each think the other's language is to learn; or some other random shit.
Often it is me sending her photos of my latest home or garden renovation project and her making appreciative noises in response much like a parent does to a favourite but rather untalented child when presented with coloured daubings on a piece of paper