It is alright
As much as I like the humor of the picture the only issue is with the mouth. I'm pretty sure Garfield should have fangs in his mouth instead of just a few teeth in front. Then again I guess the coke explains why Garfield hates Mondays? Because he can barely remember the day before. Oh well, it appears Garfield has a new and harmful addiction to something other than lasagna now.
The shading and use of just a pencil is really good too since it looks a bit like something I would do except a bit more abstract in a way. It is also a good start for you seeing as you have no other art either. I would only advice you maybe to slow down a bit on future pieces and think a bit more about the characteristics of a character. Aside from that it is pretty good for your first art submission.
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