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The Cressila (don't really know that name) has a think outline on the one of the cresents. On the blue parts of the body I think could use some shades. Also the pink thing on the back is oddly placed.
The last one is very odd. The face really doesn't show shades or lightsource. Yet again think outlines on the nose.
The first fustion isn't really bad. :) I liked it really. Nice work. Just keep on trying! ;)