Review a background removal result at useful sizes and spot missing details, retained background patches and misleading previews.
Inspect structure first
Start with the whole subject. Count visible parts and compare their shape with the original: both ears, all visible fingers, the complete handle, the ends of straps. A smooth-looking edge is not sufficient if an essential piece has disappeared. Check the empty spaces between parts as well as the outside silhouette.
Use different viewing conditions
Look at the result at its intended display size, then inspect important edges more closely in an editor after downloading. The tool's preview fits the image into a panel, so it can hide small defects. Try a white and a darker custom background in the tool before returning to Transparent for your reusable export. A pale halo may be invisible on white but obvious on a dark composition.
Imagine a person wearing a white shirt against a light wall. The main body may be retained while part of the sleeve fades away. Comparing that sleeve with the original tells you whether the missing area is genuine transparency or an editing error.
Decide whether the result is usable
For a small thumbnail, minor flyaway-hair loss may be acceptable if the subject still looks natural. For a product detail image, removing a thin strap can misrepresent the item. Use the purpose of the image to judge the defect. If repair is needed, choose another source or continue in a manual editor; ToolNivo does not currently provide an edge brush. Reopen the final downloaded PNG once more to make sure you saved the reviewed version.