Nice work so far. The figure proportions are off. The best alien and monster work is based on real proportions with only the details changed. If you use a figure reference guide like daz3D while you sculpt it will make your work more convincing.
There are plenty of reference images for alien space ships on google:
Hmm cant upload images. Anyhow try and find images of good compositions for your end render and take a look at every aspect of your work (composition, posing, lighting, materials etc.).
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The figure proportions are off. The best alien and monster work is based on real proportions with only the details changed. If you use a figure reference guide like daz3D while you sculpt it will make your work more convincing.