Please use the following steps to fix your issue;
Go to Dashboard => Appearance => Customize => Header Image => And Select the Hide Showcase Curve => Then save it.
Please use the following css to make the image same as feature image;
We have use the WidgetKIt Twitter for the Twitter updates, so we hope you have install the plugin widgetkit, after you install and activated the plugin you will get the widgetkit – Twitter widgets, so you need to keep this widgets inside the footer widget. We hope this will be helpful to you, if not then please let us know.
We are really sorry but could you please explain your issue with screenshots, so that it will be easy to both of us to find the solution asap. We hope you understand.