Ann Smarty - aka SEOSmarty - has written a great overview of image search. If you look for images online this is well worth a read to hone your searches and find the right engine for you.
The article gives insights into filters, tagging and how best to use these features to really find what you are looking for. Ann's has great expertise in this area and there are other posts about image search worth adding to your must read list.
Optimising Digital Marketing Campaigns with Search, Social and Analytics
At SES London (9-11 Feb) you'll get an overview of the latest tools, tips, and tactics in Paid, Owned, Earned, Integrated Media and Business Intelligence to streamline your marketing campaigns in 2015. Register by 31 October to take advantage of Early Bird Rates.