It looks like Foundry.js and the Nickel theme CSS have different ideas of the width of the author images.
Nickel CSS:
Foundry looks to be setting the width to 50px inline. The result? The image looks "squashed" - 50px wide by 40px high. I'm okay with overriding this with a CSS fix (height:50px), but I thought you'd like to know.
Nickel CSS:
div#fd.eb .eb-post-top .eb-avatar img {
width: 40px;
height:40px;
...}
Foundry looks to be setting the width to 50px inline. The result? The image looks "squashed" - 50px wide by 40px high. I'm okay with overriding this with a CSS fix (height:50px), but I thought you'd like to know.