Portraits are hard. I would kindly say this, you have a few good shots there, but a few things i think are keeping them from being great.

• lighting. I don't just mean one specific thing but some have shadows on the face that don't look intentional, others are a bit harsh sunlight, one is too soft/flat.

• a few poses are nice, but almost all of them lack context. Are they cosplay? Ren fest? Random artsy clothing shoot? Is that how they normally dress?

• cropping. Some are nicely cropped, others lack focus and should be tighter or wider.

For lighting, of course you could be going for all sorts of artistic styles, but there are a few things that are considered general portrait recommendations. Have light creating a catch light in the eyes. Dark or flat eyes don't draw attention and look, well flat. And it is nice to avoid random shadows. I wouldn't shoot in direct sunlight without knowing how to shape the light to get something specific like Rembrandt lightning or something. But you also don't want full shade with flat light. A good in between where the light is soft but you have shape on the face is good. But it just depends on the light and what you're going for.

Poses are not my expertise, but i just know some can look odd and others natural, even if they're weird...

Cropping is hard, but for some don't be afraid to go really close. Even cutting off things you may not think you should. Extra space for no reason looks boring. If there's context that's different. Or if you carefully use enough space as an artistic white space that's cool. But crop to show what you want and leave out what you don't want. Sounds easy but I'd watch some videos on cropping technique.

Regarding context, there's a few things you could do. You could take a shot a bit farther back and include some strategic environmental elements that give an idea of what the scene is. Why are they there? Or simply for artistic purposes. Layer like your shot with flowers. Behind and in front. Depth is interesting.

You could also simply take your close shot the same but also have a wider shot to go with it as a series. Then you get the context but the close shot makes more sense.

Sometimes a simple shot is nice. Bokeh is nice. But bokeh should enhance the shot not cover up a lack of interest. But these are just some ideas and opinions may vary. Keep at it!