First figure
\documentclass[border=10pt,tikz,multi]{standalone}\usetikzlibrary{decorations.markings}\begin{document}\begin{tikzpicture} [line width=.8pt, decoration={% markings, mark=at position 0.25 with {\arrow[line width=1pt]{>}}, mark=at position 0.5 with {\arrow[line width=1pt]{>}}, mark=at position 0.75 with {\arrow[line width=1pt]{>}} } ] \draw [help lines,->] (-4,0) -- (4,0) coordinate (xaxis); \draw [help lines,->] (0,-1)coordinate(-yaxis) -- (0,4) coordinate (yaxis); \node at (1.5,0) {$\times$}; \node at (-1.5,0) {$\times$}; \draw [postaction=decorate] (3,0) arc (0:180:3) ; \draw [postaction=decorate] (-3,0) --(-2,0) arc (180:0:.5) --(1,0) arc (180:0:.5)--(3,0) ; \node [below] at (xaxis) {$Re(z)$}; \node [above] at (yaxis) {$Im(z)$}; \node [below left] {$O$}; \node at (-1.5,.8) {$\gamma_{1}$}; \node at (1.5,.8) {$\gamma_{2}$}; \node at (2,3) {$\Gamma_{1}$}; \node at (3,-.5){$R$}; \node at (-3,-.5){$-R$}; \node at (1.5,-.5){$1$}; \node at (-1.5,-.5){$-1$};\end{tikzpicture}\end{document}for the second figure just add yscale=-1 to tikzpicture environment and replace \node [above] at (yaxis) {$Im(z)$}; with \node [above] at (-yaxis) {$Im(z)$};
\documentclass[border=10pt,tikz,multi]{standalone}\usetikzlibrary{decorations.markings}\begin{document}\begin{tikzpicture} [yscale=-1,line width=.8pt, decoration={% markings, mark=at position 0.25 with {\arrow[line width=1pt]{>}}, mark=at position 0.5 with {\arrow[line width=1pt]{>}}, mark=at position 0.75 with {\arrow[line width=1pt]{>}} } ] \draw [help lines,->] (-4,0) -- (4,0) coordinate (xaxis); \draw [help lines,->] (0,-1)coordinate(-yaxis) -- (0,4) coordinate (yaxis); \node at (1.5,0) {$\times$}; \node at (-1.5,0) {$\times$}; \draw [postaction=decorate] (3,0) arc (0:180:3) ; \draw [postaction=decorate] (-3,0) --(-2,0) arc (180:0:.5) --(1,0) arc (180:0:.5)--(3,0) ; \node [below] at (xaxis) {$Re(z)$}; \node [above] at (-yaxis) {$Im(z)$}; \node [below left] {$O$}; \node at (-1.5,.8) {$\gamma_{1}$}; \node at (1.5,.8) {$\gamma_{2}$}; \node at (2,3) {$\Gamma_{2}$}; \node at (3,-.5){$R$}; \node at (-3,-.5){$-R$}; \node at (1.5,-.5){$1$}; \node at (-1.5,-.5){$-1$};\end{tikzpicture}\end{document}