Project 1 : Lion's face
Project 2 : Colored swan
Project 3 : Curved owl (TripAdvisor style, w/ Curvature Tool)
Project 3 bis : Curved owl (Tripadvisor style, w/ Pen Tool)
Obviously from the very result I had, I tend to prefer the Curvature Tool, since it's easier for me to draw shapes (sadly my drawing skills are no great :/).
Project 4 : Freehand drawing & bushes