This is a rather broad question. To what positive and negative effects for Montenegro do you refer?
By your inclusion of the request for pictures I will assume you mean the positive and negative effects of the country in world media.
First, it is important to note that Montenegro, until very recently (2006) was not completely an independent country. As far back as the middle ages Duklja, as it was then known, gained its independence from the Byzantine Empire but was conquered by the Nemanja family dynasty and incorporated into the territory of Serbia. For most of the 15th to 18th Centuries Montenegro was autonomous (having relative freedom in its self-government) from the Ottoman Empire. Then it became a theocracy (system of government where priests rule the country).
In the 20th Century it was called the Principality of Montenegro and became a Kingdom in 1910. It was formally part of the Kingdom of Serbs, Croats and Slovenes in 1922 and later the Kingdom of Yugoslavia. From 1944 till 1989 Montenegro was a constituent republic of the communist Socialist Federal Republic of Yugoslavia with significant autonomy. After Yugoslavia broke up in 1992, Montenegro remained with Serbia in a smaller Federal Republic of Yugoslavia.
Now, regarding the view of the country in the media. For most Americans Montenegro was not known until the war in Kosovo began in 1999 when NATO forces bombed some targets. Montenegro, however, had participated in the 1991-1995 Bosnian War and Croatian War. For this, charges of human rights violations have been raised.
In 2006 a popular referendum made independence from Serbia possible. If you google the country by name you will find pictures and newspapers announcing this event.
It is a popular tourist destination because its has a coast and mountains. To this fact, there is positive effects for the Montenegrin economy (and people) as well as for world awareness of the country.
It does not hurt that part of the Bond movie Casino Royale took place in Montenegro.
A negative for the country would be its connection to the 1991-1995 wars explained above as well as a lack of infrastructure for tourists today.
I hope this helps.