Art on the internet.

[dantheman123]

Does anyone know where I can get some files off the internet that I can then use as artwork to be printed by 4 colour lithographic process? I want to use "The tree of life" By Gustav Klimpt. It is ok for me to use this as he has been dead for more than 70 years.
The difficulity i am having is that the pictures I pull off the internet are not of sufficient quality and the end result looks pixilated. Any ieas?

[RATTER15]

Search in Google images using the advanced tab and set the resolution at point that will not pixelate.