[Theme: Twenty ten] category archive with thumbnail

hi,

i am using twenty ten. i am tring to change category archive.
> my category archive

i d like to put in a 150×150 thumbail in front of title.
>like this

<?php the_post_thumbnail('' ); ?><h2 class="entry-title"><a href="<?php the_permalink(); ?>" rel="bookmark"><?php the_title(); ?></a></h2>

or

i want to custom
> like this.

please, please code me