Another comment on the mountains: I think you may be slightly exceeding the amount of scale-variation the symbols can endure without the line-weights becoming conspicuously different. Also, some of the larger ones look heavily upsampled ... depending on how you're achieving the scale variation (some kind of randomized brush, I'm assuming) you can prevent that by creating the brush at a higher resolution and only randomizing downward.

Hope that sounds helpful rather than finicky. It's a fine line sometimes.