I like the general style, but I think that first page is really over crowded - especially in the "activities" sections. I would suggest reducing the amount of text and ensuring proper amounts of whitespace to enhance readability. The text also needs to be auto-hyphenated if it's going to be fully justified - those large gaps in the sentences make it really hard to read. The logos in the 'Tools for Archaeological Scientists' area seem slightly too big for the space. While it's nice to have some of these, I would suggest that they could be cut (or reduced by 1/2) to free up space and make the flyer more readable. I agree that QR code would be a user-friendly, easy/good way to get that non-standard OSF URL in peoples' bookmarks lists, and it could be put in the space that is currently occupied by the software logos. There also needs to be more space between the "reproducibility spectrum" figure and the text above it. As it is, it runs together and is not easy to separate the text inside the figure from the paragraph above it...
On the second page, we could move some of the software logos to the bottom left corner, freeing up that space by only showing the top half of our Archaeological Record paper (with its 48 wonderful coauthors!).