Thanks man, I'm gonna try to go back and replicate the work at a higher pixel count with a pre-defined color palate rather than vomiting up whatever I have selected at the time (not PRECISELY how I chose my colors, but when I moved from 100 px per inch to 200 I totally lost my color palate file - it had been some time since I worked on it and... yeah)

I used that ole standby of render clouds w. a threshold layer to fill out the coastlines, so that's actually going to be at least a tad random every time I work on a new map, which isn't really thrilling me right now. I'm going to take a look at other folks' coastlines (the ones that were done with GIMP in one of the tutorials look really good. I'll just have to apply similar techniques in Photoshop) for l'insperation.