Sourcing Images

http://www.alamy.com has a range of photos, from Winter category to Portrait. The site has 45.91 million stock images and 308.384 video clips. The prices for photos are fixed for any photo, depending on the purpose of the image use.  For Presentation the price is £15.00, for website design £29.00, small business marketing £39.00 and for large business marketing the price is £149.0. All the photos are sold in two formats, RM and RF. The photos can be bought online.

http://www.istockphoto.com offers only paid photos from £58 ending up to £250,000. The prices depend on the purpose of the image use and the size. Photos can be bought with credits bought from the site (10 credits- £13.75, 1000 credits- £1,012.00 and so on). There are not any free photos, but as long as a photo is bought the customer received all the copyrights for his purpose.

http://www.dreamstime.com offers free photos, the only condition being to have an account. The registration is also free.

http://www.imagesource.com - the site provides photos from £25.00 to £500.00 depending on the size (from XXS to XL).

https://www.flickr.com offers free photos under Creative Commons licensing or copyright rules imposed by users. The advance search available on Flicker has a section (on the bottom of the page) named creative commons. Ticking the box ‘Only search within Creative Commons-licensed content  ‘ the other two sections will be available. By checking both of them (Find content to use commercially ;   Find content to modify, adapt, or build upon ) ,the site will show the available photos to download for free and without any copyright mention.