I really like the idea here! The first art map ( coastline ) looks stunning to me.
The concept on combining turn-based game with RTS seems really interesting, I would be very interested to hear more details about the gameplay regarding those aspects. Also I’d be interested to hear of the scale you are planning for the game. Is the player supposed to be commanding armies? With the current size of the map and units, it does not really convey the scale of whats happening, unless it is supposed to be very small scale.
Nice work, I was honestly surprised by my own reaction to your concept.