yes you can but for that you need to do some editing on it and then use it.. that is a proper way to use the images from google.
you can uswe it but first you should get the permission from the owner of the pic, anyway there are several sites and directories that offers free royalty pictures, so you can use it for free. Hope it help Claudio
i really depends. as said, sometime it will be an issue, but you will not know which and when it will be. so my suggestion is try it. if it is not allowed than try another one. you will never know if you do not try.
It might be an issue of copyright. So it is better to have pictures from original source which are not copyright protected and allowed for public too. This is the way how I manage my work and this is a problem free way too.
i always use the pic from google, but give the credits in the end of my blog's article, (ex. The Photos from Google.com)... is it not good too?
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Its a best way of doing own creation and that can be unique to other but hiring is a ordinary. So, think ones again before doing that.
I doubt you'll get any penalty from Google, but you could get sued by the copyright owner or at best, have your website taken down by your hosting provider.
Well if you take images from Google - then optimize those images to your best advantage - use the keyword as your filename. But, if the images are copyrighted, the I wouldn't recommend using them.
You can use photos from flicker but make sure you check the license file and act accordingly. you can also get free photos from http://www.istockphoto.com/
I think it will be the best if you can make it by your own since most of them are copyright protected. Anyway, you can search photos which are not copyright protected.