What size should I use for a blog featured image in the Smithworks theme?

Start with a 1280 × 640 image for the Smithworks theme. Its 2:1 shape works well in SW Blog Post Hero and listing cards. Keep the subject near the center with extra space around it because responsive layouts and social networks may crop the image differently. HubSpot recommends a 1.91:1 ratio for Facebook and LinkedIn link previews, so 1200 × 630 is also a sound choice when social sharing is the priority. Use a sharp, web-optimized image, add useful alt text, and preview the post on desktop, mobile, and your priority social channel before publishing.