First off it is a very good likeness of Obama and the proportions look good to me, although his chin feels a little funny with that bump sticking out.. For the rendering you have some good base rendering but it feels very rough still and there are some spots like on his upper lip that does not look right. For rendering out the values you wanted to make sure that you have a mixture of soft and sharp shading and some of the shading work is a result of different textures so you want to pay attention to that.
First off it is a very good likeness of Obama and the proportions look good to me, although his chin feels a little funny with that bump sticking out.. For the rendering you have some good base rendering but it feels very rough still and there are some spots like on his upper lip that does not look right. For rendering out the values you wanted to make sure that you have a mixture of soft and sharp shading and some of the shading work is a result of different textures so you want to pay attention to that.
Hope that helps.
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