Good day, John! Hope you are doing well. You have at least two makers on your Depression glass, Belmont and Indiana Glass Company and the pieces date from 1920 to around 1932. There is honestly no premium on one maker over another--at present, the typical market range is from $15-20 per small or standard plate and $25-40 for larger serving pieces, full dinner plates and accessory items such as the small servers. As a general rule on these items, the larger the piece, the more the value! A large platter would retail from $75-100. If any have cracks or chips, the value will plummet to under 30%, unfortunately, so it is generally best not even to include a price for them if you sell in a lot.
As for the painting, while it is original art, it is guild produced--meaning the artist is not classified as listed but likely produced many works. Unfortunately, the typical retail is from $50-100 on these.
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With kind regards,
Thank you. Do you happen to know the depression glass patterns?
John, so many are so very similar that they really need to be seen in person...the Indiana Glass had about 7 pattern names per standard pattern, so it can get confusing unless you have a guide and the piece right in front of you--and again, that will generally have little impact on value.
The best valued guide would be the Warman's Guide (http://store.kobobooks.com/en-us/books/Title/RM3npCIo5U29NK9eEAaakQ) which can be handy in the future, if you encounter more, or you can go to a link like this to compare each piece:
If it is very important that you know each one, assuming the information is listed, if you could supply an image (side view and bottom view) on each pattern you have, I will gladly scroll through my hardbound guide and tell you!