yes what you said is true but instead of saying it could be better try telling him why it could better.... like how the torch in the background on the first pictures isnt giving off any light and thus doin that, it would improve the picture or something like that... and with the posing, heres what I do when I am posing something for like a wall paper, I have someone or something(like one of the drawing manequins) doing the pose you think would do best and go off of that...
Now for my constructive critism, the face rigs is personally fine but lacks character and to fix this, just look at how accaull poses and facall expressions look... and please make it to where you cant see the edge of the scene, to fix this just build everything in minecraft or use mineimators repeat feature or add some sort of extra grassland from the basic schematics that is provded with mineimator... also a good tool(in my opinion) is the DOV option in the camera settings, it makes everything look a lot better and make sure the veiwer nows where to look at(simaler to the rule of thirds)
now what i said wasnt to be mean, trust me... I just want you to get better... so my rating on this would be a 6/10 with some much needed improvment... goodluck in the future