Welcome Nils the Giant!
You're off to a good start with your map, I like the little islands and almost fjord-like jagged coastline. The mountains do seem a little separated from the surrounding terrain, my suggestion would be to have a more gradual process from plains to foothills to mountains to peaks. That applies to texture as well as colour and shading.
Another thing is that having the irregular coastline as well as equally irregularly shaped forests gives the map a busy, cluttered feeling. It might be worth looking into decreasing the irregularity of the forests (in parts, at least) in contrast to the coastline.
The last thing I can think of is maybe playing a little with the outer glow of the landmass into the sea. Again, a slightly more gradual fade set against the jagged coastline might look pretty neat.