You can set any of your images as an Album cover, which will then become the featured thumbnail image on your portfolio page.
Simply click on the image you prefer and select the Set album cover option that appears on the top left side of the window.
A cropping window will appear in order to resize the image for the thumbnail, and to give you control over which part of your image you want highlighted.
Press the Save button to save any changes, or press the Cancel button to return to your album.
WE RECOMMEND SIZING YOUR IMAGES AT A MINIMUM OF 2000PX ON THE LONGEST SIDE TO PROVIDE THE BEST RESOLUTION FOR ONLINE VIEWING.
The crop tool will allow you to crop in very tightly if required.
If you do crop in very tightly you may find your original uploaded image is not high enough resolution and this selected Album image may display some low resolution artifacts.