The recommended image sizes for Rara Academic Pro are
Banner: 1349 x 506 pixels
Blog: 358 x 277 pixels
Course: 320 x 231 pixels
Welcome: 520 x 330 pixels
Team: 330 x 358 pixels
Home-team: 584 x 580 pixels
Events 553 x 329 pixels
Home-events: 165 x 182 pixels
Services: 130 x 130 pixels
Testimonial: 134 x 136 pixels
Popular-post: 85 x 70 pixels
Page with sidebar: 730 x 330 pixels
Page without sidebar: 1140 x 430 pixels
Layout post: 246 x 246 pixels
Featured-post: 275 x 275 pixels