http://farm1.static.flickr.com/62/16...41ad211c30.jpg. Pictures like this often have the caption 'Before' and 'After'. The word 'bloke' is informal and colloquial Br Eng; 'guy' is the nearest equivalent I know of in Am Eng (although, in the UK at least, a 'guy' can be female*, whereas a 'bloke' is always male). So the writer is just referring to Gordon Brown's dark hair and his rather hang-dog (sad/depressed/expecting the worst) expression, which makes him look like the model in a 'Before' picture in an advert for anti-dandruff shampoo.
And you're right to expect a sentence after the capital E of 'Especially'. Newspapers, particularly the ones with a narrow column width, and ones aimed at a less intellectually-demanding reader (The Daily Mirror, rather than The Times, but even The Times sometimes, especially in the less formal parts of the paper) tend to do this. Their readers like short sentences, and sub-editors just spray full-stops around regardless! Well spotted
*I was once in a choir led by a music teacher in a girls-only school, who addressed the choir as 'guys' - referring to the sopranos and altos as well as the tenors and basses. I think she used the term even at school - addressing just girls.