Oringal canvas painting maybe antique my grandad give me in Frinton-on-Sea, Essex for sale

Left to me by my grandad and he was left to it by his dad and so on so I think it's quiet old don't really know much about it just it's a oringal canvas picture,I'm selling it but don't know what price I might get or want??? I'm an considering to get a antique person to look at it because I'm not to sure how much it's worth....an less you know what you are talking about than feel free to phone to arrange to come round and put a price on it or buy????my grandad left me loads of other stuff if interested my number is 9 this means a lot to me buy selling theses antique so please no time waster!!!! I probably will give it a couple of day and if there is no interest I take this ad off because I'm going to vist my family in Australia and will be gone for a few months