In January Istanbul have heavy rain and sometime flood too.
my recommendations are Greece, Turkey, and Egypt from your list, but i’m biased and would say the Maldives only because I just got back from my honeymoon there. It was a total surprise from my husband and we thoroughly enjoyed ourselves. We stayed on an island resort in Kuramathi, and although the journey was super long 24 hours including layovers, since we’re coming from the US, it was incredible. the water was turquoise, the sand was white, the villas were nice and service was great plus all the meals were inclusive and we just ate our hearts out! we went snorkeling and swimming with sharks, and watched sting rays being fed…there’s a lot to do and especially great if you’re muslim because everything was halal and the service people were south asian from all over and took care of us pretty well!
good luck - anywhere you go on your honeymoon will be amazing for many reasons
I would love to go to Maldivies, but.. luv.. wanna go to some cultural place. She said their will be not much to do in Maldives apart of lying in front of beach…