Looks like you've done well on the site so far, it looks good!
You'll find documentation about Pictorico here:
If you want to activate the Featured Content slider on a self-hosted site, the Jetpack plugin is required, and it looks like you've already installed it.
1. the featured image part is amazing, but i want to change the header image for each post or REMOVE the header altogether OR reduce the size to just the title.
If you'd like to remove the feature images on all individual posts, check out the instructions I just gave another user here: http://wordpress.org/support/topic/removing-header-photo-on-post-pages-only
Be sure to activate Jetpack's Custom CSS module. You'll then add your custom CSS in the new stylesheet editor that'll appear in your dashboard, under Appearance > Edit CSS.
2. I want to change the logo and mo matter what size i chose it does not work
If you're referring to a custom header, which you can add under Appearance > Header, the suggested dimensions are 1200 x 525 pixels. Have you tried with an image that size? When you say it doesn't work, could you provide a screenshot of what you see that doesn't look right? Here's a guide on how to make a screenshot, if you're not sure: http://en.support.wordpress.com/make-a-screenshot/
You can upload the screenshot - in a graphic format like JPG, PNG, or PDF - in your Media Library, and provide a link so I can see it, or upload it with a service like Droplr or Imgur.
If you could also provide a link to your image, I could test it on my end too.
3. i need to do some SEO to the website itself, so ANY info would be great.
This isn't theme-related, but you might like to look at using an SEO plugin. This is one example: http://wordpress.org/plugins/wordpress-seo/