Gallery images displaying very blurred and logo size in header

Hello! Really enjoying working with Enfold, its beautiful and very ergonomic :) …my questions:

1
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I am using the gallery feature from the advance layout builder but the images are coming out very blurred and low quality. I cropped and adjusted dimensions (to 660px x 445px, which is what they are displaying at) of all images before uploading them. But even when I first tried with high res large images I was still getting a blurred output.

Perhaps I have a setting wrong or the images are getting compressed somewhere?

2
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The logo size in the header is smaller than the one I have added to the middle column in the footer. I would like them to be the same size but don’t seem to have control over the header size as it keeps resizing to smaller logo.. Playing with the header height dimensions in the admin panel is a bit of a guessing game when trying to make these the same size.

3
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I would like to use a different font site wide. But one I have uploaded (Gotham Book) …is there an easy way to do this and then do the styles for the site?

Thankyou for an awesome theme and awesome support
:)