Willem van Herp, Pauwels Casteels, or anonymous?

Vanderkindere, from Belgium, sells on 27 March 2018 an "attributed to Willem van Herp" Triumph of Neptune and Amphitrite, estimated at 20,000 to 30,000 Euro.

I have found at least two other copies of the same work, but with different attributions. Stuker, from Switzerland, sold in 2014 (in the sale of a quite impressive private collection) an "anonymous 17th century Flemish" version of the work, estimated at 8,000 to 12,000 Swiss Francs. It eventually sold for 22,000 Swiss Francs. This version has since been attributed to Pauwels Casteels (active 1649-1677) at the RKD. Dimensions and material (oil on copper) are identical, the main difference are the additional putti flying in the centre of the image.

Gros & Delettrez, from France, sold another (much dirtier) version, again with the same dimensions and material, for 17,000 Euro in 2006. It was attributed to Pauwels Casteels. This may have been the same work as the Stuker version (I can't find any differences actually, which is otherwise exceptional), in which case it has had a remarkable cleaning, drop in price and loss of attribution.

The Museum of Fine Arts in Houston has another copy of the work, where the artist is not named but described as "Flemish". This one again has some minor differences compared to the other examples, like the additional boy or putto in the water at the bottom centre.

The work for sale doesn't seem to be by Van Herp, who was more of a proto-classicist (and a good copier of work by e.g. Rubens), and is more in the style of someone closer to the Franckens. Pauwel Casteels may be the right name for this. The estimate for this work seems reasonable, perhaps a bit high; it is attractive, but shows some lack of brilliance when seen up close.

UPDATE: sold for 22,000 Euro, so the estimate was spot on.

"Circle of Jan Brueghel II" is circle of Ferdinand van Kessel and Peter Casteels

Kendzia, from Hamburg, Germany, sells on 24 March 2017 a "Circle of Jan Brueghel II" Allegorical Scene, estimated at 9,000 Euro.

It is an Allegory of Taste, and while Jan Brueghel has painted similar scenes, this one seems particularly close to the works of Frans Wouters (1612-1659) (example was for sale for 50,000 Euro but remained unsold). The work offered here is a large oil on copper (55 by 72 cm), typical (though not exclusive) for the region and painters around Jan Brueghel.

The Wouters has also been copied by Jan Van Kessel the Elder (1626-1679).

The work for sale clearly is based on a reversal of motifs by Wouters, even though it isn't an exact copy.
 

The actual  origin of this painting, based on Wouters, was a work by Ferdinand van Kessel and Peter Casteels though (found via RKD, shown topmost, work for sale below it for easy comparison). It was for sale at Koller in 2008 (80,000 Swiss Francs) and 2009 (60,000 Swiss Francs), but both times remained unsold. The work for sale now is in worse condition, but even so it looks to me like a less well executed work, especially the central female figure (Venus? A well-clothed Venus in that case). It is not a real copy, enough details are different, but it obviously is the same composition.

The estimate seems a bit too high taking these things into consideration, but it still is an attractive work which is in dire need of cleanup and perhaps restoration (and if you are really lucky, it has been partially overpainted and you find an original Kessel / Casteels anyway!)