Chinese painting poem and seal meaning
it's not a poem. just a record of who send a gift to who.

read from top to bottom, right to left,

武夷雪花泉　：　a spring named snow flake (雪花泉) in mountain 武夷, in hokkien province 

建樹先生惠存　：　建樹 is the name of recipient, 先生 is used as a respectful term. 惠存, roughly a courteous term for "receive &amp; keep"

薛靈敬贈　：　the sender's surname (薛) &amp; name (靈), sending (贈) with respect (敬) 

甲子年冬日　：　甲子 is the first entry of sexagenary cycle, for indicating year, it's 1984, 1924, or any sixty years earlier. in context, it's 1984, cause the painter born in 1911, died in 1992, it's very unlikely the painter did it in 1924 (he's just 14 years old).

冬日 means in winter (winter 冬, day 日)

陳挺作　：　陳挺 (1910-1992) the name of the painter, 作 means fabricate (paint, in this context)

about the seal, the first one is provided by drooze :)

here's some afterthought about how:

1　must, and only use traditional chinese to decipher

2　determine how many characters the seal has

this one is simple, only two characters

3　determine which "ideographic description sequences" a character has

the unicode defined some structures, that how a traditional chinese character is written (u+2ff0 - u+2ffb)

eg, the left character of the first seal is ⿳, above, middle and below

the above is 艸 (u+8278), the below is 口 (u+53e3), the middle might be hard to recognise, never mind, one could guess it by listing possible choices, cause this character would be in the radical 艸 (140th).

so, only 苔, 苕, 若, 苦, 苫, 茖, 茗, 茩, 荅, 莒, 莕, 莙 has the below 口

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/radical.php?rad=140

then, checking the seal script of these 12 characters would show that

若 (u+82e5) matched.

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=若

again, the right character of the first seal is ⿰, left &amp; right; with the right part is ⿵ surround from above (or ⿱, top &amp; bottom)

the left component is 人 (u+4eba), the right bottom is 口 (u+53e3); so, the choices are:

估, 佁, 佑, 佔, 佫, 佮, 佶, 佸, 侶, 俉, 俗, 信, 倍, 倜, 偌, 傛

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/radical.php?rad=9

then, 倜 (u+501c) matched.

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=倜

when a character can't be recognised by first sight, the above method might help :)

edited.

the third seal has four characters, the first three are "有所不"

top right: 有

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=有

bottom right: 所

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=所

top left: 不

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=不

bottom left character is not recognised at first glance :(

wait :)

OK, the last one is 及 (u+53ca)

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=及

this one is in early spring and autumn style.

together, the seal "有所不及" was also used by the painter 陳挺.

have fun :)