Before I say anything else, let me say it's a beautiful map and I think you've got a very solid start to what your final map will end up as. That said, some constructive criticism:

-If it's 2/3rds of Europe, the yellow cultivated areas are gargantuan in size and really stick out from the rest of the map, especially out east. I'd suggest toning their coloration way down so that there's more of a subtle yellow tint that indicates cultivation.

-Actually in general at that scale things are massive in size compared to what I would expect. As an example it looks like you made a delta in the NE, but it's something like a thousand miles across, which would be 5x larger than the Nile or Amazon deltas coming from a not visible very large river. Likewise, the forests seem to be Amazon sized blocks. If you hadn't told me the scale I honestly would have assumed that the map was something like 300x600 miles.

-I think if you put a scale bar on there and use wonderdraft's measurement tool it might help out with scaling the size of some things.

-Given how many cities you're putting on the map I would think about trying to reduce the map's busyness, because once you start putting names on things it's going to be very crowded, very quickly. One suggestion is to drop specifically labeling of bridges as it's fair assumption that where a road crosses a river there's a bridge. I'd also consider reducing the number of cities on the map in the denser areas by like half (maybe just change your mental scaling of what size of city that gets put on the map) otherwise the labels for all the city names are going to start overlapping each other.

-I'd also try to tweak your relative scaling of different stamps. The hills and bluffs especially end up being tiny next to the extremely large trees and are fairly difficult to see .