I've completed the roads and the bridges, and have moved on to the forests (attached, 50% zoom, cropped). I had no idea it would be this time consuming, although that's perhaps because I'm placing the brushes one by one and attempting to avoid creating a too-obvious pattern. I've done the pine forests of the valley in the 'middle' of the continent, although I'm not sure which forest I'll do next.
I realise I have also made a rather fatal mistake in making the brushes. In checking the measurements in photoshop (with the rulers), it turns out my symbols are far too small to be recognisable to the eye in the size that I was hoping to print it. So much for printing it. I guess I've learned a hard lesson here, and that is; if you're drawing your map symbols digitally, always draw your map symbols with the rulers on! *sigh* Ah well, I'll persevere with this map and get it finished. I'd hate to waste the effort I've already put into it.
@Rukia_K: Thanks, I'm glad you like what I've got so far!