Probate figures are notoriously low, Kathy, so don't be disheartened by any that don't seem to represent an item's worth. Sadly, something is only worth what someone is prepared to pay, and there is a huge downturn in antiques, particularly furniture, at present. But there is a major upturn in small collectables and smaller objects, especially quirky items. Murano glass (from Murano, just outside Venice) is selling well again, if not at huge prices, having gone through a very unfashionable phase.
People are, generally, I'm afraid, swerving things that have to be polished and cleaned to look good. Accordingly, be prepared to be a bit disappointed on prices for silverplate, copper, and brass, although small solid silver items will still go well: little snuff boxes, vinaigrettes, card cases, place name holders, chatelaines, toilet and manicure sets.
Dark woods, heavily carved (i.e. dust trap) furnishings, and rugs are all way down in price nowadays. Due to popular interior design shows on telly, homeowners are furnishing in light colours, using minimal ornamentation, although the 'right' piece is still sought for certain buyers.
If you've been left any pottery, look very carefully for Clarice Cliff, whose name could sell anything, Troika pottery from Cornwall (now wildly back in fashion), Bernard Leach pottery from St Ives, Cornwall (always highly-valued, and holding), and if you find any Lucy Rie you're thousands in. Moorcroft, depending on size, colour and date, is a winner, and there are profits to be made from selected Sylvac, Carlton Ware, Royal Worcester and Royal Doulton pieces. German and French porcelain pieces, provided they're from good houses, sell well.
As for your pictures, may I suggest you don't go to the expense of getting any oils cleaned until you've had a valuer in, unless you plan to keep them yourself? Once again, the market is very selective, so if there is a gem among them, you're better off seeing if it can go through a specialist, such as Sothebys, who'd advise whether to clean or not. Proper cleaning and possible repair can cost hundreds per picture, and if that's all they'll be worth at sale, you're better off not bothering.
Sorry if I sound like Aunt Agatha on this, but sometimes it's best to wait and see what a good, respected valuer can advise if you plan to let some pieces go, rather than thinking they've got to look good before they can be sold!