Sorry for the late reply
I used several different media for the line practice because I had them lying around. There's a couple different pencils, HBs and 3B or 4B I think, as well as charcoal sticks, a sanguine stick, and an india ink pen. I discovered that I really like the feel of drawing with charcoal sticks, at the very least.
Also, in regard to the pony, you could try making his wing just a bit smaller, but other than that, I don't see many issues; he looks pretty good overall.
Hmm, I'm afraid my pony backlog is getting a bit long. If no one else in the thread can take it, you might consider checking out the pony avatar thread in this subforum (MLP: Avatar is Magic, is the title I believe). Thanqol is also looking for ponies to draw, I think so you could try flagging him down.
I think your picture looks quite good! The only things I'd mention are that Big Mac's body does look a bit small and is bent a little oddly. Also, there seems to be something a little strange about the perspective of his hooves; it seems like they should maybe tilt forward a bit more?
Anyway, that is a neat picture, and I look forward to your next stuff!
I'm liking the poke-ponies! The last one might possibly need to be a hair taller, but otherwise they look good! I would recommend drawing different poses though, as it's good practice and helps you get a solid feel for how ponies should look from every angle.
Nice! I'm curious to see what she'd look like once cleaned up and colored!
Yay! Deadly shipping sketches! I'm interested to see how these turn out...and Applecora is an excellent name
Yeah, cross-hatching was one of the things on the list to play around with, although I haven't used it much in the past myself. I'm trying to include more shading in some of the things I draw, but right now I'm really only passable with linework and basic shapes...