What do you think about this painting? What would you rate it?

It looks like an apple on a bed of hair. 

Tonally it is too 'flat'  . The apple needs more shape by putting in light reflections , white / warm cream colour). 

Next time you paint an apple ( 3 -d object) look for the light and dark parts. Also the lightest/darkest side(s) are not the extreme edges, but slightly in from the edge.  A very close observation is needed to see it. 

Also the darkest colours /shadows are warm in tone and  conversely the lighest colours/h-lights are cool in tone. 

To get the dark tones use burnt umber and prussian blue, mix, until you get that slight warmth  in the dark colour. 

Conversely , use ochre/white for the hi-lights. 

Do NOT use Black!!!!  it 'flattens the painting.  Nature does not do 'black'. 

Remember , art is all about seeing and looking. 

Hope that helps!!!!

What would you rate this painting i found online it is called the green man of mars.

The colors are beautiful. My only advice would be to add a bit more depth. It kinda looks like armor rn. 

Wish I could see it in person.  To me it looks like a rotting pear and the painting work is excellent.  Don't try touching up the fruit but the "shadow" effect could use a little brightening.   Otherwise, I really really like it!  Good job!

Is it a bell pepper or a granny smith? I think, the colors together look pretty cool! You know how to match colors!

I think it is pretty good for a first attempt. But you need to pay more attention to light and shade. I feel your apple should have some highlight and should throw a shadow. 

You have a grasp on shading and making the 2d look 3d with one hue you have created something that is, and that's not easy

hate the color but that's just preference

I think it's very good. I like the shading and it looks really realistic

I couldn't do much better