Googles prefreed method would be
https://developers.google.com/custom-search/v1/overview
Quote:
Pricing
Free quota
Usage is free for all users, up to 100 queries per day.
Paid Usage
Any usage beyond the free usage quota will fail if you are not signed up for billing. Once you have enabled billing, you will continue to receive 100 free queries per day. However, you will be billed for all additional requests at the rate of $5 per 1000 queries, for up to 10,000 queries per day.
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Or you could scrape google images but they are pretty good at blocking.
Or you might be able to iframe the search query but then you won't see the clicks, etc.
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