I wouldn't do that with such special bag but you did great job. I don't agree with some пеопле that Hermes will not notice it. They don't service the bags inside and often craftsmen even don't look inside but if they do it I suppose your bag is stll brown inside on the edges. I see leather extension on the zipper puller still is brown and I suppose horizontal edge over the zipper also is brown and you can't paint easy that areas without risk for bag. Also future reselling price ( if you sell it of course) of this bag is lower because of that.