Is it unfinished on purpose? Or are those lands supposed to be there as they are (uncharted).
If they are supposed to be left uncharted, I don't think you needed so much of it, as it makes the map look unfinished.
Overall, colors are well picked and the linework is great. To my taste, the transitions are too rough. Plains to swamps, mountains to anything else, should be dealt with greater care. But, no matter what, for a free commission, it's a nice bargain
Congrats!
(And Rep points for the very nice gesture of taking a free commission)