SBonse on "[Theme: Photolistic] Post Footer Thumbnail image quality"

I'm starting this new topic just in case someone else is looking for the same answer so I apologize in advance for the "nagging".

I changed my thumbnail size for the featured images in the footer to:

#content .hfeatures img {
	width:280px;
	height:280px;
}

So they no longer look stretched. Now I'm wondering about image quality. The pictures look pretty blurry or pixelated. Is there anything that can be done to lessen this?

Website
Thank you!