\documentclass{article}
\usepackage[english, russian]{babel}
\usepackage{tikz}
\usepackage{tikz-qtree}
\usetikzlibrary{shadows, trees,arrows, automata, positioning}

\begin{document}
%\tikzset{level distance = 60pt, sibling distance = 19pt}
\begin{tikzpicture}[
scale = 1,
grow = down, %up down left right, '
edge from parent fork down,
font = \Large,
sibling distance = 7em,%== 100 %, 0.5 == 50 %
level distance = 3em, %между уровнями
frontier/.style = {distance from root = 150 pt}, %уравнивает листья
]
\Tree
[.ABC %создали узел абц
    [.A
        [.C K ]
        [.\node(d){D}; L ]
    ]
    [.B
        [.\node[draw]{E};\node[draw, circle, red]{M}; ]
        [.F
            [.G \node(n){N}; ]
            [.\node[draw,circle]{H};
                [.I \node(o){O}; ]
                [.J P ]
            ]
        ]
     ]
]
\draw[dotted, ->] (d) to (n);
\draw[red, dashed, ->] (d) [bend right = 60] to (n);
\draw[blue, <<->>] (d)..controls +(south:3) and +(south west:5)..(o);
\end{tikzpicture}

\newpage

%ГРАФ
\tikzstyle{dot}=[circle, fill = black, inner sep = 1.5pt]

\begin{tikzpicture}[
font  = \Large,
->,
>= stealth',
node  distance =2.8cm,
loop above/.style={min distance = 8em, in = 60, out = 120}
]
\node [dot, black, label = below:$v_1$](0){};
\node[dot, label = $v_2$](1)[above right of = 0]{};
\node[dot, label = below:$v_3$](f)[below right of = 1]{};

\path
    (0) edge [bend right = 20] (1)
    (1) edge [bend right = 20] (0)
    (f) edge (0)
    edge [loop above](f);

\end{tikzpicture}

\newpage

\begin{tikzpicture}[
scale = 1,
grow' = right, %up down left right, '
%edge from parent fork down,
font = \Large,
sibling distance = 1em,%== 100 %, 0.5 == 50 %
level distance = 5em, %между уровнями
%frontier/.style = {distance from root = 150 pt}, %уравнивает листья
]
\Tree
[.A %создали узел абц
    [.\node[draw, red]{B}; \node(f){F}; ]
    [.C \node[draw, circle, blue](g){G}; ]
    [.D
        [.\node(h){H}; ]
        [.I \node(k){K}; ]
    ]
    [.\node[draw]{E}; \node(j){J}; ]
]
\draw[->, red] (k) to (h);
\draw[<-, yellow] (k) to (g);
\draw[<->, dotted, blue] (k) to (j);
\draw[<-, dashed, green] (k) to (f);
\end{tikzpicture}

\end{document}