yes please dont be discouraged
keep at it! I like the fact that you drew it yourself! (practice those faces young man!!

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sometimes using a lot of filters obscures the artwork and text more than helping it. Mess around with a softer or flatter bevel maybe or none at all.. and that plastic wrap filter is outdated ;>.. it's just not used much anymore.... we all love the filters when we learn photoshop!!! especially bevel, emboss, and plastic wrap!!! I know I did
Try working with some complementary colours (more similar to each other) or possibly even contrasting colours (opposites) or pick a tone... like all earthtones, or if you like blue, try different shades of blues =].