(Assuming the photograph is big enough.) An icon has multiple images and you can select which ones to create by putting a checkmark to them when creating an icon. If you want to keep a lot of details, you should have the largest (256x256 image) checked. The smaller ones will have less details. When the small image is viewed in the editor and zoomed in, it may look blurred. Look in the lower left corner to see it not zoomed (you may need to drag the pane or close some panels), just like Windows will display it.



