Nice stuff.
Well, first off, your drawings are cool. Like hamsters as you would say

. Cool like my birds

. I especially like that one of Freya. So cool... especially the head (I can't seem to draw canine heads. I'm ok at cats but my best are birds. Just love birds).
Anyway, with the first pic of the not so happy guy, I would think that it looks odd mainly because of the eyes. I think that you should move them closer together till they are about one eye length apart.
I don't have many problems with the Freya pic. It's cool like a hamster

. I guess the only one I could find was with the legs. I can't really explain it properly but it just looks a little awkward.
Not many problems with this either. The placement of everything is dead on

. Only thing is the light glares in the eye furthest away from us. It's uneven with the other one.
I like this last one

. Just like Leopold from Simpsons (his left eye gets bigger every now and then when he yells).
Anyway, cool pics. Why don't you colour them if you have photoshop. Sorry if that was hurtful... but it's just the regular artist c&c. Criticise me all you want...