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I can help with 3D modeling of monsters and their animation. I can also create icons using Photoshop, Paint, and Unreal Engine.
Added 7 minutes later
I didn't come up with a good idea for the swamp; if you look closely, there are many mountains there. It would be better if you came up with something like a portal opening somewhere and an island being transported there. As for the plot of the game Campaign: an island in another dimension is starting to dry up, and mages are conquering the lands. You need to defeat the mages, obtain 8 artifacts from various islands, and use these artifacts to open a dimension back to the original world to survive.
Added 5 minutes later
It would be better to use a brown color, as it is associated with something disgusting, slimy, and dirty.
Added 2 minutes later
I'm on a roll! Have you noticed that the map looks like Europe and Africa, but Russia is empty there; you could place something in Russia.
Added 28 minutes later

I created a hero concept in 5 minutes, but instead of a horse, you could use some kind of lynx, and instead of a troll, you could use a lizard.