Thumbnails too small and need to display in a grid.

Hi:

My website is: http://www.juicysquid.com its a webcomic.

As you can see, I use rectangular thumbnails for each post/comic.

I want to use this plugin to display a grid of recent posts, similar to how my front page looks.

However I am having some problems.

1: The thumbnails shrink down to 50×50 or so for some reason.

2. I want to display my images in a grid instead of just a single column. Is there a way to do this?

3. While I am asking questions, is there a way to remove the title and description, and JUST display an image for each post?

P.S.
I am using the PRO edition (I paid the $8) and I am planning on using the short-code to implement this plugin. So far I am using the following shortcode:

[srp widget_title='Recent Comics' display_thumbnail='yes' widget_title_hide='no' thumbnail_width='500' thumbnail_height='500' post_type='post' post_limit='16' post_title_length='0' post_date='no']

Thanks.

I used 200×200 images for each post. I wanted to use this plugin to display

http://wordpress.org/extend/plugins/special-recent-posts/