Regarding your mix of hand-drawn elements and digital - I do that a lot in my maps. However, all line work, including mountains, rivers, coastline should all be done as hand-work. Keep the digital aspect to color only and this would look a ton better. I know you started this when you were 12 - and at that age, this is an excellent quality map. Now that you're no longer 12, its time to fix the rivers and create a truly artistic masterpiece. Don't you think?