Charlotte - Recommended Image Sizes
Featured Image Size
For your featured images, images should be no smaller than 1000x850px, but no larger than 2400px. That size will ensure your images display correctly in all areas of the theme (front page, blog page, category pages, etc).
Post Slider Featured Image Size
If you are using the post slider homepage option, your featured images will need to be at least 1700x800px.
Post Image Size
The width of the blog post column depends on which layout you're using:
- Full-width layout (no sidebar): 950px
- Sidebar layout: 750px
For the clearest possible display, we recommend uploading images roughly twice the size of the post column (1500 to 1900px).
If page speed is a concern, then you can upload images right at the post column size (950/750px). Larger images won't affect your page speed all that much, unless you have a huge number of images in one post.