If you have a real picture and you would like to know the author and the cost, it makes sense to turn to professional artists. This can be done via the website http://forum.artinvestment.ru This page will help you to evaluate your existing artwork if you provide it a full information, namely the origin of the painting, the approximate time of creation, size (vertical and horizontal), material, and technique image (for example, canvas, paper, cardboard, watercolor, pencil, oil, etc.). To description attach a good photo. The image will be approximately estimated by the experts and will tell you whether it has any artistic value.
If you have only recollection, or are you just interested in some image, refer to the resources page http://www.tineye.com . Upload your desired image on this website and you will see all pages that contain such a picture. It is highly likely that this will be the website of the artist or any gallery where you can easily find out the name of the author.
Carefully examine the image. Check the picture of the signature, the date, any other marks. If you are strong in painting, it makes sense to ask teachers local art school or Museum staff. They are more likely to experience art and style, manner of drawing will be able to determine at least the approximate time of creation. If you assume that the painting was bought from a local artist, Museum or city art gallery are likely to know him and his style of writing. Which means you in the short term determine the cost of your treasure.
In that case, if the picture looks quite old, but well preserved, be careful. If the first critic said that the painting is not worth anything and then offers to sell it for a ridiculous price, it makes sense to find out more about the painting, visits to other lovers of art. Perhaps in your hands is a little-known masterpiece, worth a lot of money. Especially not to hurry with the sale, if the painting has got you inherited and maybe it is a family treasure.