User Activity

I use the eBay app, or via Safari, I had an avatar, but a couple of days ago it disappeared. I cannot find anyway to upload another, thanks.
In the 'Sell-Sold' section of 'My eBay', on the 'Activity' tab, under 'Sold' the first field is 'Awaiting Answer' - what does this mean? There are 2 items I have sold listed, but I haven't received any questions to answer.