Hi Mimine, firstly, welcome to the Guild!
This is a very pretty map and I love the textured feel of it. The colours are attractive and I like the wave effect in the sea. It's too bad that it's not fully labelled but you can't have everything.
A couple of small points... You may have some river violations down near the bottom centre of the map. In one place, just above the small forest area, you have a river running from one coastline to another. Not sure if that's meant to be a manmade canal? A natural river wouldn't flow that way. Just slightly to the right of this, you have a river splitting long before it reaches the coast. Is that meant to be a delta? It doesn't quite sell 'delta' to me as it is, and looks more like a split. The only other thing that caught my eye is how you have some lines and elements overlapping. For example, in one or two places, you have grass tufts sitting on top of the dots that make the road, and I think it would be cleaner if they didn't overlap. And perhaps you could put the black city icons on top of the roads, rather than having the roads on top. This is mega nitpicking for sure, but it would give a clearer, less cluttered result if these items don't overlap, IMO.
Nitpicks aside, this is a gorgeous map and a fantastic debut at the Guild! Looking forward to seeing more from you.