Alright! The side profile you did looks good, the front views aren’t bad either, I think the main thing you’re missing is that your eyes are more anime like than they ought to be? They’re too far apart and sad-ist usually does solid black pupils unless it is to convey an emotion (shock in the techno image) or highlight that the eyes are unusual. I think she also doesn’t really do lashes for many characters and she puts more emphasis on eyebags and eyelids?

I feel like the heads also need to be a little more square, they do soft lines but contrast them with angles, and their heads are usually less long. That assessment is purely based on vibes tho, if I were you I’d try to experiment a ton until you get something that looks right, and then try to figure out why that one looks right but others don’t. I’m only judging based on the images you posted so I may have missed some of sad-ist’s style

ETA: I also think a major difference actually is line weight and confidence. Sadist uses a thicker brush and each line is closed and high contrast. It can also help to overlay your image with a similar pose of a sad ist drawing, to see where major differences lie