The phrase "a number of illustrations" is correct and usable in written English.
It can be used when referring to multiple illustrations that support or clarify a point in a text.
Example: "The report includes a number of illustrations to help visualize the data presented."
Alternatives: "several illustrations" or "various illustrations".
His inventory includes the latest fossil discoveries, and it is graced with a number of illustrations from his own pen.
As John Updike wrote of "Charlotte's Web" in The New Yorker in 1999, E. B. White's centennial year, "A real spider has eight eyes and two big fangs, as a number of illustrations consulted by White … repulsively show.
The annotations by Rowling include comments on the process of writing and a section from an early draft of the novel, along with a number of illustrations drawn by her and a note on how she came to invent Quidditch, a sport played by characters in the books.
But the pair reconciled in 1645, and she gave birth to four children, including three daughters who grew to adulthood, two of whom appear in a number of illustrations here reading, with varied degrees of devotion, to their difficult, blind father.
A number of illustrations from the original paper are included".
The chapter also demonstrates a number of illustrations, how these design patterns can be exploited.
The Field Guide to the Orchids of Costa Rica and Panama (Dressler 1993) includes an introduction with a small number of black and white illustrations, and a number of illustrated keys (Fig. 2).
There are a number of good illustrations of applications of FDA; for example, Ramsay and Silverman [ 9, 10] using curves as data, Locantore et al. [ 11] with images as data, and Yushkevich and Pizer [ 12] where the data points are shape representations of body parts.
That everything includes a number of telling illustrations.
There are a number of visual illustrations, some of them vilely reproduced - which may be just as well, considering what the people portrayed in some of them are up to.
A number of rare illustrations, including a first edition of "Where the Wild Things Are" and an original sketch for the cover of "Little House on the Prairie," go on auction this month at the Swann Galleries.
