The projection in your scribble is web spherical Mercator. The data you get from natural earth is geographic wgs84. You want qgis to transform your projection on tge fly to match. Not sure what u mean by curve.
Hi Nathaniel,
Thanks a lot for your reply.
Is there any way to download natural earth data in Web Spherical Mercator projection (like used in Scribble, Google Maps etc.). Or is there any way to convert the projection in QGIS?
No. Natural Earth comes plain vanilla. You need to cook it. Try something like:
http://linfiniti.com/2011/03/on-the-fly-raster-reprojection-comes-to-qgis/