Yes, I agree with Grogs adjusted skull outline.
blade84, of course we can always do micro-tweaks to our models, but after a quick look I think yours is basically very good. Any tweaks an artist might do depends a lot on what they’re going for. So, if you’re not sure what to do next, go back to reference and your original goals, and some idea will usually emerge sooner or later.
amir jahanlou, sorry I’m not very good with cartoony characters. Yours looks ok, the topology could probably be a bit more evenly divided, and ‘organic’, but then again maybe it doesn’t matter for what you plan to do with this character. You’ve highlighted two edge loops, not sure why, if it’s because you focus your topology efforts on keeping nice clean long edgeloops, then maybe that’s something IMHO you could focus a bit less on. If they spiral or just end abruptly, that’s okay, as long as the rendered result looks good.
I recommend putting a temporary rigging in, a simple skeleton then do some poses, do some test renders, and you should soon see if there are any huge problems.