I do seem to be facing some problem, if anyone could help me out.
I followed the instructions posted on the link provided by Jake, set the correct height and width on the css. ".avatar .img.m { width: 150px; height: 300px !important; }"
The width works fine, but the height doesn't seem to play that well. The avatar is seeming to be "cut off" halfway, I'll attach a screenshot.

as you can see the avatar is being "cut" halfway and is not reaching its full height.