Apologies for the delay in getting back to you. Life unexpectedly intervened, but I'm back now and I can give your delightful painting my full and prompt attention.
Let's assume this is an original rather than a print. Without taking it out of its frame it's going to be hard to know for sure, but I can see nothing about it from the photos that would indicate it was anything other than an original.
What a a delightful composition! The more one looks at it the more little people appear in the sweet pea flowers. I count at least six and seven if you include the caterpillar. There's also a mysterious profile of a face lower right, and I'm sure you've seen much more.
Fairies riding soap bubbles and hiding among petals, and hidden faces are all so typical of Harold Gaze's work. He was a prolific illustrator and author with at least seven titles to his name.
Harold Gaze (1884 - 1963) was born in New Zealand and studied in London around 1914. After the first world war he lived in Melbourne, Australia where he illustrated his first book. In 1920 he returned to London to continue his career and then moved permanently to southern California in the early 1920s. While a resident of Pasadena, he was the author-illustrator of several children's books and worked for Disney Studios for many years. In about 1959 he returned to England for the last years of his life and died in 1963.
So looking at comparables in the sales record, this example, of the same size, subject matter and date (1929) sold at auction for $2750 which I would say is about right for this artist, who does seem to have a keen but limited following of collectors.
If you were to sell yours at a good antique auction house, it would fetch in the range of $2000 - $3000.
It therefore has a full retail value (if you saw it for sale in an retail art gallery, say) of $6000. This is also the replacement value for insurance purposes.
I do hope this helps!
Please let me know if you'd like me to explain or expand on any of the above, I would be glad to.