Okay I checked the map and here's what I've noticed. I know you said it's a WIP for now.
I. The forest area lacks some details and it's a bit flat. You could have also used water doodas instead of Blizzard water which seems odd to me. Also sometimes even I get lazy with pathing but I don't use Blizzard cliffs because it ruins the tileset imo. You could have also tinted those grasses a lil' bit dark green, just a bit.
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II. Winter Castle: You got lazy again with placing the tiles from Talavaj. For example at the top you could have placed them diagonal to fit with the stairs and some hiders near the edge walls. Also I would change those blue flags.