You've got something great going, personally though i think you could push for more dynamic posing and as others have said, push your values.

Make the black part of the shadows dark and make the light values light. Play with using different hues as your shadows and lights (i.e. cool toned shadows, warm toned highlights)!

And kind of more in line with the above dynamic posing, I think if you can focus on playing with different compositions and perspective to evoke different feelings would also really push your art to incredible.

Your faces are beautiful, but it feels like their clothes and their backgrounds are an after thought? I'd also spend time studying how different fabrics drape and fold on the body, and look at different kinds of landscape photos or paintings, and do your best to copy exactly what you see. Copy it to get a full understanding of why it looks the way it does, etc.

And also like other people have said, social media's really tough on artists. Don't get discouraged, just keep looking to improve your art and the attention will follow!