Tikz in xetex - Recreate two ways of presenting/displaying old sources

Question

I would like to present old digitalised sources with tikz picture in LaTeX for private purposes similar to the presentation of Luther's sources by Google, which you can see here: https://artsandculture.google.com/exhibit/3wIyuklRxxPJJQ (no direct link possible).

I am particularly interested in re-creating a presentation as in the following picture (without the white box in the lower right-hand corner and the arrows left and right):

and in the in this second one (without the arrows left and right):

I have tried a bit around, but it is very difficult for me to recreate the presentation style with tikz. You can find the code I have so far. Feel free, to use any example image of your own or you can use one like this.

\documentclass{article}
\usepackage[margin=0cm, top=0cm, bottom=0cm, outer=0cm, inner=0cm, landscape, a4paper]{geometry}
\pagestyle{empty}

\usepackage{polyglossia}
\newfontfamily\Libertine[Ligatures={NoCommon}]{Linux Libertine O}

\usepackage{graphicx}
\usepackage{tikz,tikzscale}
\usetikzlibrary{
shapes.geometric,
quotes,
arrows,
arrows.meta,
calc,
backgrounds,
positioning,
decorations.pathreplacing,
bending}

\begin{document}

\begin{tikzpicture}[remember picture, overlay, background rectangle/.style={fill=black}, show background rectangle]
\node[opacity=0.88,inner sep=0pt] at (current page.center){\includegraphics[scale=.9]{image}};
\draw (1,10) node[text=white] {\fontsize{10}{10}\textit{\Libertine{Source description}}} {};
\node [shading = axis, path fading=north, fill=black, opacity=0.25, rectangle, shading angle=0, anchor=south, minimum width=\paperwidth, minimum height=5cm] (box) at (current page.south){};
\end{tikzpicture}

% I am not even quite sure how to write the second image in tikz code. :/
\begin{minipage}{.45\linewidth}
    Text here on several lines.
\end{minipage}\hfill
\begin{minipage}{.45\linewidth}
    \begin{tikzpicture}
        \includegraphics[scale=.5]{image}; % or crop pic
        \node [shading = axis, path fading=north, fill=black, opacity=0.25, rectangle, shading angle=0, anchor=south, minimum width=\paperwidth, minimum height=5cm] (box) at (current page.south){};
    \end{tikzpicture}
\end{minipage}

\end{document}

Answer 1

A possible implementation of the first image. The approach is to draw a node with the image in it and a very thick 2cm border. Then, draw a second node with the description. This description has white text, is positioned with its left side on the left side of the image node, 5cm down from the middle, it has a black transparent background but the text is not transparent. Inside is a box of fixed width which is left-aligned.

Code:

\documentclass{article}
\usepackage{tikz}
    \usetikzlibrary{positioning}

\tikzset{
  image/.style={
    path picture={
      \node[anchor=center] at (path picture bounding box.center) {
        \includegraphics[width=6cm]{leichenpredigt}};}},
  node/.style={
  rectangle, minimum width=8cm, minimum height=11cm, line width=2cm, draw =black!100, node distance = 26mm}
}

\begin{document}
\begin{tikzpicture}
    \node[node,image] (bookpage) {};
    \node[text=white,below = 5cm of bookpage.west,anchor=west, fill=black,opacity=0.4,text opacity=1] {\parbox{4cm}{\raggedright Sophie Amalie of Brunswick-L\"{u}neburg (24 March 1628 -- 20 February 1685) was queen of Denmark and Norway as the consort of the King Frederick III of Denmark.}};
\end{tikzpicture}
\end{document}

Result:

EDIT using fading and more detailed positioning:

\usetikzlibrary{fadings}
\tikzfading[name=fade up,
  bottom color=transparent!0, top color=transparent!100]
\begin{tikzpicture}
    \node[node,image] (bookpage) {};
    \node[text=white,minimum width=9cm,below = 4cm of bookpage.west,anchor=west, fill=black,path fading=fade up] {\hspace{-1cm}\parbox{7cm}{\vspace{5mm}\tiny\raggedright Sophie Amalie of Brunswick-L\"{u}neburg (...)}};

Result:

Sources:

Tikz node background image not centered when using right= of

Increase the thickness of node border in TikZ

tikz text location within node

How can I align two nodes to the left in TikZ?

Transparent node with opaque text?

Tikz fade with transparency so background is visible in beamer?