It is a very common technician in animation do vibrate two pictures between yes to give the feeling of life, fear, wind, etc
Not to have to draw this can use gmic. With the distortion textured glass” can generate similar pictures, but no identical of the same drawing.
gmic Square1.png fx_textured_glass 42.4,42.4,1.38,1.76,0,5.63,15,0 output square2.png
This also can do with Gimp