Put an image in a render_to_response Django

I´m developing an project in Django and I have a view that generate a chart as am image and return it to me as a web page into a HttpResponse(). And it already works, but that´s the thing, I need to put some more informacion on the page and buttons....

So how can I return this image in a render_to_response()? Cuz in this I can tell wich templeta use and place my stuff there. Or how can I place html stuff on the HttpResponse() with the image?

Here it is my code that I wanna transform in a render_to_response(), it´s a function that generate a multiple line chart:

def chart(request):     
    if 'checks[]' in request.GET and request.GET['checks[]']:
        #getting id's of selected tags
        chosen = request.GET.getlist('checks[]')
        tags = Tag.objects.filter(id__in = chosen)
        fig=Figure()
        ax=fig.add_subplot(111)
        strIdTags = ""
        #getting all values of all selected tags
        for tag in tags:
            if Values.objects.filter(tag = tag.id).count > 0:
                #values of one tag
                values = Values.objects.filter(tag = tag.id)
                strIdTags+=str(tag.id)
                strIdTags+="; "
                x = []
                y = []
                #all values of one tag
                for value in values:
                    y.append(value.value)
                    x.append(value.datetime)
                    #ax.plot_date(value.value, value.datetime, '-')
                ax.plot_date(x, y, '-')
                ax.annotate("Tag "+str(tag.id), (x[0],y[0]),
                arrowprops=dict(facecolor='black', shrink=0.05))
        ax.xaxis.set_major_formatter(DateFormatter('%d/%m/%Y - %H:%M:%S'))
        ax.set_title("Values of Tags: "+strIdTags)
        ax.set_xlabel("Date-Time")
        ax.set_ylabel("Values")
        fig.autofmt_xdate()
        canvas=FigureCanvas(fig)
        response=HttpResponse(content_type='image/png')
        canvas.print_png(response)
        return response