I’ve seen a lot of Finnick fanart, and finnodair on deviantArt most certainly makes an impression. The gallery is full of Finnick and Annie, and each piece is fantastic (though some is NSFW).
Here is the most current contribution, titled “Product” (I love it!):
I also really like this one of Katniss and Finnick and Annie’s son:
Go check the rest of the work in this gallery out! You won’t be disappointed!