I can't see the picture you provided, so I can't determine the specific content of this seal. But generally speaking, the content of the seal may be a phrase or theme related to the painting, or the name or signature of the painter.

Regarding the painting you mentioned, I can't make a concrete evaluation on its quality or value because I can't see the picture. But generally speaking, the quality of a painting depends on many factors, including technology, creativity, theme, color, composition and so on. If you are interested in painting, you can try to find professional art critics or art historians, who can provide more detailed opinions and suggestions.