I have a oil painting of 2 waterfalls signed by orrs any Ideas of price?

Its oil painted on card , looks quite old , and the signature is in
bottom left of painting ( ORRS )
Its an oil painting of 2 waterfalls with some mountains in back ground and 2 white birds flying in front of waterfall

not to worried about price ,Its just I cant find any artist that have painted waterfalls ,under this name. Any Ideas welcome