Novally's Sprite Thread (C+C needed!)*

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You use a bunch of colours that could easily be merged into a single shade. The dark yellow dots inside the P stick out, since both of the two colours you tried to smooth with them are brighter.
Using darker spots in at the borders of your sprites will most likely stick out on most backgrounds - such styles only work when you know what backgrounds will be used (and thus, using transparent PNGs isn't the best idea, you should use a fixed colour instead).