Cannot tell from your photo but we keep the light from them, in the dark with paper a sack over the top to help draw the moisture of. Keep some soil on as it is a preservative, helps to keep the spud. If washed, they will soon grow spours,I reckon washed potatoes as bought in bags must have a preservative on them ? Once I am happy with the dried spuds I then bag them in to 10/12 kg paper sacks, throw a bit of straw in to help draw any moisture and keep them in a cool place in wooden boxes built on wooden pallets. Only thing to watch for then is mice in the winter when they come in-doors.
Would like to ask you some questions on that very nice looking DB885 'Bottle-Opener' that you have parked in that shed. But I think it would be better on the Equipment page.