铅笔画再美也是灰色的
[qiān bĭ huà zài mĕi yĕ shì huī sè de]
Literally, it means 'no matter how beautiful pencil sketches might be, they are still only shades of gray,' symbolically pointing out imperfection within something cherished – acknowledging art's limitations and possibly expressing that while something appears perfect, it remains lacking in fullness compared to vibrant realities of colors.