How do I put a value on my art to sell?

You haven't mentioned if they are originals or limited editions.

Artbrokerage.com seems to have most of your artists listed there. Based on the prices of some of the original art pieces listed there you probably should start with an appraisal by a reputable art dealer.

Thanks for the info, I have a certificate of Authenticity on each one along with a certificate of tirage. It reads that they are an authentic, limited edition original print, hand-signed by the artist and guaranteed as represented

There are several threads on this very subject in the archives of the art forum. Look for the name Lightwizard in the column for Author - or any place else he posts - he is quite smart on all this.

I'll look later and see if I can find just the right threads to point you to, but it isn't all to hard to look yourself, since the art forum is nowhere near as large as the politics forum.... or, good grief, the General forum.

Look at art forum, and go to the earliest threads and work forward.

Being limited editions makes them easier to price. Often a google search of the artist and name of the piece will bring up information of what others are trying to sell them for. If the editions are very limited then you might get some idea based on other editions from the artist. Size of the piece and number in the edition are often the determining factors in comparing them to other editions by the artist.

Consider how much you wish to sell the works (the greater your desperation, the lower the price) and discover how much others want to purchase them (the greater their demand, the higher your price). Not easy goals.