Why, thanks! I'd love to make a tutorial but I'm pretty busy with college right now, maybe someday I'll do it c:
But there really isn't any secret to drawing a good lineart, I mean it's the part of the drawing process I hate the most, all you have to do is practice a lot, use ctrl+z a lot and just keep trying lol
Also, I can't draw a single smooth line on Photoshop so I use PaintTool SAI! I highly recommend this program if you don't use it already. I've heard of this program
[link] too, it basically helps to draw smoother lines on photoshop and other programs but I never tried it.