Can "秀气" be used to describe objects that aren't people?
秀气
基本解释:

样子清秀 (elegant appearance)

言谈文雅,举止优美 (elegant demeanor)

(器物）小巧灵便 (elegant, exquisite object)

灵秀之气 (elegant feel)；秀美(elegant)。小巧而清秀 (delicate)



(1) and (2) definition are mostly used to describe people
(3) definition said it can be used to describe 器物 (object)
Example:
秀气的刺繡  (delicate embroidery)
秀气的雕塑  (delicate sculpture)
(4) definition said it describes something that emit delicate, elegant or graceful feel
Example:
秀氣的山水 = 山明水秀 (exquisite landscape)
秀气的文章 (elegantly written article)
寫得一手秀氣的字 (able to write elegant hand written words)