So, last night I made a small island map in Photoshop. It's not much, but here it is.

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It's only 600 x 400. So, my reason for this thread is to ask for some advice. What I want to do now I make a new document, about 3000 x 2000 (to maintain the aspect ratio), overlay and then stretch the small jungle map out. I'm not going to use the actual map for anything other than a reference, however. I'm gonna make a new map, using the same shapes and lines, same forests, mountains, rivers, and swamps, but more detailed.

So the advice I'm looking for is... what kinds of details could I add? Cities, ruins, roads are all obvious choices... I'm even toying with the idea of doing a 6000 x 4000 so I can REALLY get into the details. Thoughts? Advice? It's all much appreciated