Struggling arranging pictures in WP Pages

Wow, now I'm embarrassed to ask this as it even surpasses my usual standards but I'm making a page in WP and I need to arrange the pictures on the page underneath one another.
Now in the visual editor they appear under one another, however when I view them on my site the pictures are all askew and basically push themselves upwards to fall under the text above. See Pics

Anyone know how I can make this work. I think it may be an idea do use <div>clear=left</div> but I can't get it to work properly.
Any help would be greatly received.