/ic/ - Artwork/Critique

H: Lines drawn horizontally
V: Lines drawn vertically
D: Lines drawn diagonally

How do I into vertical lines? Is it really worth it practicing drawing at every angle when I could simply turn the paper? Also, on that note, would it be worth it practicing drawing lines, circles, etc. in both directions? Up until now when doing these exercises I've been drawing basically every line from left to right and/or upward and every ellipse in a counter-clockwise motion.