\begin{tikzpicture}
	\onslide<1->{
		\node (img){
			\includegraphics[width=1.0\linewidth]{images/model}
		};    
	}

	\onslide<2,4->{
		\draw[->,line width=1.5mm,color=green!50!white](-3,-1)--(-1,0);   
	}


	\onslide<3->{
		\draw[->,line width=1.5mm,color=red!50!white](-3,4)--(-1,3);    
	}   
\end{tikzpicture}
