I'm rather fond of that size too, Ly-ly. Anywhere from 18-24" seems like the right size depending on how broad and how thick any exaggeration is. The ISD is sort of like that for proportions. But yeah, 18" SSD is just fine.
I find it's partially how I hold my brush Big Mac, otherwise my hands shake quite a bit and if I ever put my elbow or forearm on the table at all it gets really bad from the pressure. But a lot of it is just using the side of the brush to line it in progressively smaller regions.
-laughs- thanks Salty (Exsalted, heh), though there's always a bigger fish
But, I can at least say I'm either really persistent, really bored, or quick enough. I finished up most of them while mulling over what to do with the standard TIE ln.
Too bad the reds didn't come out as bright as in person, but I'll see what I can do about that some other time. I'll admit, I'm really really tempted to sell all my own Imperial Squadrons and use whatever I get just to buy more Imperial squadrons to repaint. Saves on the Simple Green