I love the backround colors and brushes. You did a fanstastic job. One of the things I like to do is change m y painting into a black and white, to see if it still moves me. If not then I go for more contrast.
Also, I did that sketch video, click here
I am glad to see you went for a natural look, instead of my lame metal looking pear. I went to crazy with the dodge tool, but it is a cool way to get a pear looking like metal hehe. You captured the natural look well.
I did a quick paint over if you do not mind, tried to add more contrast for a little more drama.
I made a brush to try to match the big one you used for the backround. I added some darker colors to the left to draw the eye to the pear. Also added some more details where the light hits. Added a little more texture to the left side and middle of the pear. Changed the lighting just a tad, turned down the second left light, which hardly cast any shadow now, and turned up the right light and changed the shadow to make the wall look closer. Also I think from the direction of the light this is more how the shadow would be. I also darkened the shadow to help the pear stand out more.
I should have taken a little more time to make the light hitting the pear look more natural, that is add some texture. Also I added a little of the backround color to the left side of the pear, refracted light. The bottom right side of the pear I added a little of the ground color for more refractive light.
Then I added a little green to the stem, because it seemed to only have browns. Then I added a suttle highlight to the stem and to the pear right where the stem grose out of.