Post Image Size

Hi, first of all thanks for this great theme.
I’ve customized what i could by myself but i have some questions.
Please note i can’t post link because I’m testing it on localhost but I’ll provide screens and be as descriptive as I can.

1.I have added following code in css:
.single .entry,
.page .entry,
.error404 .entry {
padding: 2px;
margin-bottom:5.1% !important;
}
so text in the post has no white space on the left and right
I also removed lines around the image and border lines of content area.

http://i.imgur.com/r5I3dXv.png

So my question is how can I make pictures same width as text and is there any way I can make pictures in posts not clickable?

2.How can i eliminate space shown on the image and make text as wide as thumbnail.

http://i.imgur.com/FcWH3tU.jpg