Most people check the demo of the themes and templates and aspire to have their website looks the same as like the demo. But the problem arise when they choose wrong dimension images for their websites. The preview of themes created to attract users to purchase item and images chosen are best of quality and perfect sizes. For example images used for showing a team page are all of same dimension i.e. 600px/600px for all of the team members and team page looks awesome with every image complementing the other.
To get a perfect look for your website give some time in putting and uploading equal size images for a particular area of the website i.e. blog, staff, portfolio etc.
Hope this article will help many of the theme users.