Are you able to post snippets and screenshots.
Other than that, make sure your images are displaying as block and have a border of 0.
<img src="src.jpg" border="0" style="display: block; width:xpx; height:ypx" width="x" height="y"/>
Try the CSS important declaration.
Put that at the start of your
<style> tag and use it as like any other font - just remember to keep the fallback!