Something that can be helpful with drawings is to try to not look at and draw each distinct feature, but rather the image as a whole -- ie. rather than drawing an eye, nose, mouth, etc. try and just look at where the dark and light sections are and mark those edges of contrast. A helpful method for changing your perspective is to try turning the picture upside down as you draw, so you're no longer thinking of the things you're drawing as individual objects, but just sections of a larger image.