User-agent: *
Disallow: /*.jpg$
Disallow: /*.gif$

user-agent: sogou spider
Disallow: /

user-agent: Googlebot-image
disallow:/*.jpg$ 
User-agent: Slurp
Crawl-delay: 10
User-agent: EmailCollector
Disallow: /
User-agent: WebZip
Disallow: /
User-agent: WebZip/4.0
Disallow: /
User-agent: wget
Disallow: /