Plot3D[-3 y/(x^2 + y^2 + 1), {x, -2, 2}, {y, -2, 2}, 
      ViewPoint -> {2, 2, 0}]

Plot3D[-3 y/(x^2 + y^2 + 1), {x, -4, 4}, {y, -4, 4}, 
      ViewPoint -> {2, 2, 1}]

Plot3D[-3 y/(x^2 + y^2 + 1), {x, -4, 4}, {y, -4, 4}, 
      ViewPoint -> {2, 2, 1}, AspectRatio -> 1.5]

Plot3D[4  x^2 + y^2, {x, -2, 2}, {y, -2, 2},  
      ViewPoint -> {2, 2, 1}]

Plot3D[4  x^2 + y^2, {x, -2, 2}, {y, -2, 2},  
      PlotRange -> {0, 20}, BoxRatios -> Automatic, 
      PlotPoints -> 50, Mesh   ->  False, 
      ViewPoint -> {2, 2, 1}]

Plot3D[4  x^2 + y^2, {x, -2, 2}, {y, -2, 2},  
      PlotRange -> {0, 4}, BoxRatios -> Automatic, 
      PlotPoints -> 50, Mesh   ->  False, 
      ViewPoint -> {2, 2, 1}]