Composition and use of silhouette is quite good. The figure seems to be off somehow though. I think it's because it looks like a mermaid, but the tail seems to be made of rock? If this distinction were clearer it would be better. Adding more contrast might help as well (ie making the light brighter).
I would also suggest making the preview a tad larger so you see the full torso of the figure.
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Composition and use of silhouette is quite good. The figure seems to be off somehow though. I think it's because it looks like a mermaid, but the tail seems to be made of rock? If this distinction were clearer it would be better. Adding more contrast might help as well (ie making the light brighter).
I would also suggest making the preview a tad larger so you see the full torso of the figure.