I think it is always useful to study the work of people / artists you admire or aspire to, and see what techniques or skills they are using in their work. You can then add these into your own work, with your own originality.

For example, the idea of being taped over the mouth is a metaphor for not being able to speak (i believe in this case - out of context with the rest of the song, I'm assuming it is not actually describing someone who has literally had tape put over their mouth). It is taking an emotion of feeling opressed and putting a physical description to it. Try listing different emotions you would like to write about, and describe them in physical terms. It can be very powerful in song. This is a technique used in the hit 'bleeding love' - physical bleeding used as a metaphor for emotional pain.

Let me know if that is helpful

Dielle