Thank you for contacting Mearto and I apologize for the delay. Usually, these kinds of paintings are ink on silk. The calligraphy appears to read: 武山, which is a location in northern China. The red seal is unidentifiable. The brushwork is skillful and in a traditional style. It is likely from the 20th century or late Qing.
For paintings like this, prices vary. I have included some links below to hammer prices for similar paintings, to give you an idea of what I am basing my estimate on.


$200
https://www.liveauctioneers.com/item/43594223_chinese-scroll-painting

$200
https://www.liveauctioneers.com/item/77451944_large-chinese-scroll-painting

$225
https://www.liveauctioneers.com/item/20025848_chinese-watercolor-scroll-painting

$350
https://www.liveauctioneers.com/item/10763577_312-chinese-scroll-painting

$450
https://www.liveauctioneers.com/item/55395191_chinese-scroll-painting-of-crane

$500
https://www.liveauctioneers.com/item/94434022_chinese-scroll-painting-signed-shen-quan