I think that Whose Who source is correct in stating that the Irwin titles were Donenfeld’s first attempts at publishing girlie pulps on his own even though he had fingers in Frank Armer’s artists and models and girlie pulp magazines along probably with some involvement in Joey Burton’s humor/girlie mags years earlier. I’d assume that the artist responsible on the two covers you show also designed the logos, as there is some art worked in (the adorning lassies). The art on these titles is a little primitive compared to some of the other pin-up artists working at the time but have a very quirky charm. The artist, notably, is Worth Carnahan (notice the C inside of the W) who was active as an artist and publisher at the dawn of golden age comics. I recently picked up an issue of Joy Stories by the same artist, 1930-02:
http://i.imgur.com/ZP0kI.jpg
I haven’t scanned the issue yet but here’s the indicia page at least:
(link does not work, so deleted)

Or here’s another cover by Carnahan, the earliest I’ve seen by him for the first issue of “Cap’n Joey” Burten’s Follies Quarterly in 1925. Independent News distributed and I suspect the Donny Press did the printing:
http://i.imgur.com/ENHXk.jpg
full issue scan available here:
http://www.mediafire.com/download.php?icc4nwxbrsxinjz

Carnahan even published and did art work for his own girlie/humor title in the early 30s, Wild Cherries.

As for a little information on some of the titles you’ve listed, La Paree began and ended a long run as a Donenfeld pulp. Pep Stories started as Pep! under Frank Armer as a pulp/artists model hybrid on nice paper, switched to a pulp format sans photos, and was eventually bought out by Donenfeld (who did the printing) by Donenfeld in 1932 when Armer hit some financial difficulties. Gay Parisienne was published by Deane (possibly just another of Harry’s shell companies, it looks like it) but by 1932 was listed as a Merwil pulp (definitely one of Harry’s, a tip of the hat to his editor Merle Hersey – who had been married to Harold Hersey, also of pulp fame). Snappy began as you mention as Snappy Stories published by New Fiction which ran romance stories but started to get into some spicier fare with pinup covers in the 20s and then switched to Snappy Stories and Pictures in 1927 and 1928. Lowell publications resurrected the title simply as Snappy (and also apparently tried a couple more issues of Snappy Stories) around 1929/1930 and Donenfeld took it over in 1932 and it ran until the end of the girlie pulp era in 1938, a long and interesting life!

Off of the top of my head, some other Donenfeld logos you might consider would be Tattle Tales or Bedtime Stories, examples of which you can find here:
http://darwinscans.blogspot.com/2012/01/happy-new-years-girlie-pulp-covers-of.html