it's 羅綺, in traditional chinese, in Small Seal Script (小篆)
the left character is 羅
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=羅
the right one is 綺
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=綺
1st, it's in vertical writing, you need to read from top to bottom, from right to left
羅庚香色 ⒓⒐⒌⒈
綺申似凝 ⒔⒑⒍⒉
寫春玉瓊 ⒕⒒⒎⒊
京樹 ⒏⒋
characters 1-8 are in traditional chinese, in 隸書:
香色
似凝
玉瓊
京樹
"色凝瓊樹﹒香似玉京" is derived from a 劉禹錫 (a poet of 唐 dynasty)'s poem 和令狐相公詠梔子花
蜀國花已盡﹒越桃今已開﹒色凝瓊樹倚﹒香似玉京來
且賞同心處﹒那憂別葉催﹒佳人如擬詠﹒何必待寒梅
characters 9-14 are in traditional chinese, in 行書:
羅庚
綺申
寫春
庚申 is one of sexagenary cycle, used to record time, day, month & year; 春 is spring; together, it's either spring of 1920, or 1980.
last, "羅綺" is the name of author; "寫" is write.
have fun :)