I've been working on a topography map for a mod I've been making and I've found it to be incredibly difficult. Through a long time trying different things in paint.net I managed to get something looking alright at best...
Starting image
Next step
When I attempt to add mountains and hill... it doesn't really work out.
I was wondering if there was any way I could change that original image and make it CK2 topography friendly? Or is there a much easier way I could be doing this? If anyone has any advice on programs and/or that I could use, or any other type of thing it would be very appreciated because i'm extremely lost

Starting image

Next step

When I attempt to add mountains and hill... it doesn't really work out.
I was wondering if there was any way I could change that original image and make it CK2 topography friendly? Or is there a much easier way I could be doing this? If anyone has any advice on programs and/or that I could use, or any other type of thing it would be very appreciated because i'm extremely lost