Very nice map for a first try. Excellent layout, nice colours, good choice of graphic elements. The font you used is great... would you share the name?

Of course there are some things that you could improve.

Be careful with your brushes! You have quite some overlappings and cutoffs at the borders of your woods... especially the left side borders. You might want to repair that by hand... lots of work, but might be worth it.

Taper your rivers! Rivers tend to be narrower at their origins, getting wider as they join.

Last of all (pet peeve of mine) consider the base colour of your map! With a real paper / parchment background, it is rather easy to darken the background with inks and paints... but how would you make it lighter?