Follow the naming conventions of existing anime series. The majority of existing anime series are named after the show's protagonist: Naruto, Sailor Moon, and Hellsing are some well-known examples. Major plot points are also often used as titles.
Visit the official Anime Character Database site, which has a lot of information compiled about different anime series. Think about some specific details of the show, like character names, or the year the show was first released. Use the Anime Character Database with specific parameters to narrow it down.
Just upload it into Google Image Search. It would easily finds similar picture of yours and give the exact name/ description of anime.
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