Correct usage of HTML5 `figure` and `aside`

I have a chunk of a page that looks semantically this:

Heading A

Textual information related to heading A.
Blah blah blah blah blah.

[image gallery related to heading A]

I can think of a couple of ways to mark this up:

Method 1:

<section>
    <h1>Heading A</h1>

    <p>Textual information related to heading A.<br />
    <p>Blah blah blah blah blah.</p>

    <figure>
        <img />
        <figcaption>Image 1</figcaption>
        <img />
        <figcaption>Image 2</figcaption>
    </figure>
</section>

Method 2:

<section>
    <h1>Heading A</h1>

    <p>Textual information related to heading A.<br />
    <p>Blah blah blah blah blah.</p>

    <figure>
        <img />
        <figcaption>Image 1</figcaption>
    <figure>
    </figure>
        <img />
        <figcaption>Image 2</figcaption>
    </figure>
</section>

Method 3:

<section>
    <h1>Heading A</h1>

    <p>Textual information related to heading A.<br />
    <p>Blah blah blah blah blah.</p>
    <aside>  <!--Method 3b: use section here-->
        <figure>
            <img />
            <figcaption>Image 1</figcaption>
        <figure>
        </figure>
            <img />
            <figcaption>Image 2</figcaption>
        </figure>
    </aside>  <!--Method 3b: use section here-->
</section>

Method 4:

<section>
    <h1>Heading A</h1>

    <p>Textual information related to heading A.<br />
    <p>Blah blah blah blah blah.</p>
</section>
<aside>
    <figure>
        <img />
        <figcaption>Image 1</figcaption>
    <figure>
    </figure>
        <img />
        <figcaption>Image 2</figcaption>
    </figure>
</aside>

Which is the semantically correct way of doing it?