Born July 18~ Elisabeth von Eicken

Elisabeth von Eicken (July 18, 1862-July 21, 1940 was a German landscape painter.
Biography on Wikipedia:

Fishermen on the Bodden near Ahrenshoop by Elisabeth von Eicken
C.1895 / Oil on canvas / 12-3/5″x9-4/5″ / Private collection

Elisabeth von Eicken on Artnet:

Further reading:

Born July 15 (or not?*)~ Bessie MacNicol

Elizabeth “Bessie” MacNicol (1869–1904) was a Scottish painter and member of the Glasgow Girls group of artists.
Biography on Wikipedia:

A Girl of the Sixties by Bessie MacNicol
c.1900 / Oil on canvas / 32″x24″ / Glasgow Museums Resource Centre, Scotland, UK

Bessie MacNicol on Artnet:

Further reading:

* Wikipedia lists the date as July 5, Grove Art Online lists it as July 15, and Benezit Dictionary of Artists as July 17, and various sites support one or another of these three. I have arbitrarily chosen to go with the 15th.

Born July 14~ Juliette Wytsman

Juliette Wytsman-Trullemans (July 14, 1866-March 8, 1925) was a Belgian impressionist painter of landscapes and gardens.
Chrysanthèmes roses by Juliette Wytsman
No date / Oil on canvas / 25-4/5″x17″ / Private collection

Born July 13~ Bronisława Rychter-Janowska

Bronisława Rychter-Janowska (July 13, 1868-September 29, 1953) was a Polish realist painter associated with the Kraków-based Young Poland movement.
Biography on Wikipedia:

Jasna noc w Tatrach by Bronisława Rychter-Janowska
C.1920 / Oil on cardboard / 13-4/5″x19-3/4″ / Private collection

Bronisława Rychter-Janowska on Artnet:

Further reading:

Born July 12~ Florence McClung

Florence Elliott White McClung (July 12, 1894-1992) was an American painter, printmaker, and art teacher who was associated with the Dallas Nine, an influential group of Dallas-based artists.
Squaw Creek Valley by Florence McClung
1937 / Oil on canvas / 24-1/4″x30-1/4″ / Dallas Museum of Art, Dallas, TX

Born July 11~ Alexandrina Robertson Harris

Alexandrina Robertson Harris (July 11, 1886–February 1978) was a Scottish-born American painter of portrait miniatures.
Biography on Wikipedia:

Jacqueline Cochran by Alexandrina Robertson Harris
c.1950 / Watercolor on ivory / 3-1⁄2″x2-3⁄4″ / Smithsonian American Art Museum, DC

Alexandrina Robertson Harris on Pennsylvania Academy of Fine Arts

More links:

Born July 10~ Ulrika Pasch

Ulrika “Ulla” Fredrica Pasch (July 10, 1735-April 2, 1796) was a Swedish painter and miniaturist and a member of the Royal Swedish Academy of Arts.
Biography on Wikipedia:

Boy with Map of Scandinavia by Ulrika Pasch
1771 / Oil on canvas / 26-2/5″x21-1/4″ / Nationalmuseum, Stockholm, Sweden

Ulrika Pasch on Artnet:

Further reading:

Born July 6~ Frida Kahlo

Magdalena Carmen Frida Kahlo y Calderón (July 6, 1907-July 13, 1954) is one of Mexico’s best-known artists, often described as a surrealist or magical realist painter.
Biography on Wikipedia:

El Suicidio de Dorothy Hale by Frida Kahlo
1939 / Oil on Masonite with painted frame / 23-4/5″x19-1/10″ / Phoenix Art Museum, Phoenix, AZ

Frida Kahlo on Artnet:

Further reading:

Born July 3~ Maria Martin

Maria Martin Bachman (July 3, 1796-December 27, 1863) was an American painter and scientific illustrator. She contributed many of the background paintings for Audubon’s The Birds of America.
Biography on Wikipedia:

Bachman’s Warbler / Audubon-Martin collaboration
1863 / Watercolor, graphite, gouache, with touches of black ink and pastel and selective glazing
Named for Maria Martin’s brother-in-law and later husband, Reverend John Bachman

Maria’s Woodpecker~ Maria was honored by Audubon in Birds of America. He named Maria’s Woodpecker for her; this is now considered a subspecies of the Hairy Woodpecker and unfortunately no longer bears her name.

Further reading:
Audubon’s Method and Technique:

Born June 30~ Sigrid Kopfermann

Sigrid Kopfermann (June 30, 1923-June 25, 2011) was a German painter, graphic artist, and art teacher.
Biography on German Wikipedia: From Google Translate

Landschaft (Landscape) by Sigrid Kopfermann
1993 / Mixed media on canvas / 39-2/5″x27-2/5″ / Found on Van Ham auction site

Sigrid Kopfermann on Artnet:

Further reading: (all in Google Translate from German)
Sigrid Kopfermann
Sigrid Kopfermann was born in 1923…
Sigrid Kopfermann – An Obituary