My author photo is cut badly (my head is cropped on the back cover). Can I crop or reposition it?

Yes, from version 1.9.18. Open Authors, open your profile, and under "Author photo" click "Crop". Drag the photo to position it, and zoom with the slider or the mouse wheel until your face fills the frame; the guide lines help you put the eyes on the upper line. Choose "Square" (best for the round photo on the back cover) or "Portrait". Two previews show the result: "On the back cover" (round) and "In the book" (next to your bio). Press "Use this photo". The photo you uploaded is always kept, so you can frame it again at any time without losing quality. A newly chosen photo opens this window by itself. Your books use the framed photo at their next export.