Nice for beginning!
Scandinavian design picture:
First problem is pillows////
Is need some geometry /smoothing group's/ and texture /bump and natural reflection+glossiness+some effect of roughness/ tweak's on the cloth of pillows, or adjust already existing///
In some pillows bump is too strong///
wicker seat look some plastic, It may be due to the fact is no textures on it, only diffuse color///In real life there is not exist completely clean surfaces ///
General lighting too uniform, may be made less active light inside room, that giving feeling of illumination from window side///
Test render 3w:
Same problem with sofa materials, too clean, only white diffuse color///
Pillow's geometry needs to Smooth modifier or Smooth group///
Thumbnail:
Need to render pictures in some higher resolution to something we could say about this///
Good luck!
PS. Excellent render's in you website