Based on some musings in a deeper thread, a slight modification brings it to 131:
map{$i=$_/20-1;map{$r=$j=$_/20-2.3;$z=$i;($m=$r*$r,$n=$z*$z,$z=2*$r*$z+$i,$r=$m-$n+$j)for a..z;print$m<4?$":"+"}0..59;print$/}0..39
Update: With a bit of hackery then at 130:
map{$i=$_/20-1;map{$r=$j=$_/20-2.3;$z=$i;($n=$z*$z,$z=2*$r*$z+$i,$r=($m=$r*$r)-$n+$j)for a..z;print$m<4?$":"+"}0..59;print$/}0..39
As a note, using 'X' instead of '+' would save 2 characters.

If a slight readjustment of the newlines isn't invalid, you get 126:
print map{$i=$_/20-1;$/,map{$r=$j=$_/20-2.3;$z=$i;($n=$z*$z,$z=2*$r*$z+$i,$r=($m=$r*$r)-$n+$j)for a..z;$m<4?$":"+"}0..59}0..39

In reply to Re: (Golf) Mandelbrot Fractal by tadman
in thread (Golf) Mandelbrot Fractal by {NULE}

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