it's 羅綺, in traditional chinese, in Small Seal Script (小篆)
the left character is 羅
the right one is 綺
1st, it's in vertical writing, you need to read from top to bottom, from right to left
characters 1-8 are in traditional chinese, in 隸書:
"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
characters 9-14 are in traditional chinese, in 行書:
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 :)