Thank you for contacting Mearto. This a Chinese painting on silk with a calligraphic poem. The red seal is the mark of the artist or collector, but it is unidentifiable. I cannot give you an accurate date of the painting, but the vividness of the colors suggests to me that it is no older than the 19th century (late Qing).
For Chinese silk paintings of this size and type, without known artists, prices can vary. Your painting is very detailed and skillfully painted, so I have tried to find works at a similar level as a comparison marker. The staining will negatively affect the price, but it is very minor, from what I can see in your photographs.
Based on sales of other paintings like this one, the Fair Market Value is between $400 and $600.