The book is available at Internet Archive, Hathi Trust, and Google Books.
The illustrations are done by different artists, sometimes signed in the lower-right corner, while others are not signed. I have made a Flickr collection.
Punho and Saswi: text
King Dyach and Bijal: text
Momul and Rano: text
Saif-ul-Muluk: text
Umar and Marai: text
Kauro and Chanesar: text
Rajbala: text
Prince Amul Manik and the Princess Husini: text
Jam Tamachi and Nuri: text
Suhni and Mehar: text
Hir and Ranjho: text
Birsing and Sunderbai: text
Kamsen and Kamrup: text
Dodo and Chanesar: text