What time period is the question taking place in, so I can give an accurate answer.
Answer:
The third one
Explanation:
I like the third one because it's kind of at an angle. I don't like the one with the pink background because her hair is pink. The second one is good, but she looks a little discusted. The third one is my favorite. She is at an angle, that makes the shadowing look better. You are a great drawer!
Acoustic instruments.
Simple chord progressions such as C-F-G or Am-G.
Simple time signatures such as 3/4 or 4/4.
"Sharp" or natural keys such as C, D, E, G or A.
Simple scales such as pentatonic minor (blues), pentatonic major, major, melodic minor and mixolydian.