DA does have the “Artist has requested critique on this artwork” display option, you know.
And for good reason, it’s needed too!
Some people like to fish for compliments, or faves. (Cool pic! Awesome! etc.) Others would prefer if their comments actually said something meaningful.
Some people enjoy critique; (you did the waist much better than in your last pic; it would look better if you made the arms longer from this perspective; have you tried using software X etc.); other will BLOCK you (and yes, this has happened to me) if you even as much as mention something you think could be improved.
Even following somebody is not so easy. I want to shower artists that I really like with praise and feedback (and corny jokes), especially if they don’t seem to get much recognition. But some artists are shy or would prefer to be followed by X crowd only (X meaning some social group that is not you).
So you may even scare them and unintentionally seem stalker-ish or unwanted.
So it doesn’t hurt if you out it in your journal, put it in your DA settings, that you LIKE receiving comments or that you WANT feedback on something. People will respond, believe me.
Now, as for simply being FAMOUS - that’s a whole different bowl of rats. Naturally if you are well known you’re gonna get more comments (including idiotic wants) and vica versa.
If you are not that good at art yet (not that I know), then you can make up for it by being sociable and going out of your way to interact with people.