what is artist impression?

in the previous assignment which is assignment 2... phase 2... zul and i faces some difficulties during doing artist impression... we both quite not clear about artist impresssion...after doing a lil bit research on artist impresion... based on what i understand... It is an idea on how the final product will look like when its complete... like the measurement of everything with a human figure include in it... well here are some example of what artist impression are...