Stippling
Stippling is a drawing technique by using only dots to create your piece. By using marker pens such as Unipin or Artline, ranging from 0.05 to 0.8, gives a depth of field in creating your art.
Hatching
Hatching is done by filling the blanks with lines. It is can be done with whether far or narrow, straight or slant, and horizontal or vertical. However, bear in mind not to over-do them in one place as it may result in like you were coloring in one spot.
Fish - Hatching Technique
Taj Mahal - Stippling and Hatching Technique
House - Two Perspective Drawing (Two Vanishing Points) Hatching Technique
Ice Cream - Stippling Technique
Butterfly - Stippling Technique