Yeah, practice, practice, and practice. It’ll get easier the more you do it, but that’s not really useful to hear, so let me list a couple of things that come to mind.
It looks like you increased the density of the mesh way too early. This is why you have a lot of wobbly-looking geometry (eyeballs, eyelids, nose) because it gets a lot harder to smooth everything once your mesh is that dense. Concentrate on the shape first before you tackle the details. Only increase the mesh when you have to, not when you want to. This is a very common mistake when you’re first starting out.
The eyeballs are usually a sphere that is not connected to the head. It makes them much easier to animate and even when I do very low-poly art I use a separate mesh simply because it gives me more control without affecting the topology of the face.
The eyes are too big compared to the structure and style of the face (at the least on the bust with the hair; it looks better on the sketch and the sketchfab model, but even there you’re skirting on the edge of being anatomically correct). The space between the eye is usually exactly the size of one eye. Regardless of whether you’re leaning more towards a realistic or anime style, this is sth to keep in mind.
The ear is a lot bigger than most people think. The woman in your reference image has fairly small ears; usually it goes as low as the bottom of your nose and up to your eyebrows. You might want to model the ear on a separate mesh and then
If you’re going for a more anime-styled approach, you want to keep the noses slimmer and less pronounced.
If you’re sculpting with a reference and you don’t have much experience designing characters, try to match the concept art as closely as possible. Looking at the sketch and the head below it, the 3D model’s chin is a lot rounder, the space between the nose and mouth got longer, and the nostrils got a lot more pronounced (but to be fair, the sketch is stylized so that might simply not translate well into 3D, at least not with a proper shader to bridge the gap :p).
But yeah, maybe look at a couple of tutorials to see if there’s something that can help you, but apart from that, I think practice is the only way to really improve.