I don't think it looks bad at all. But I do have some critique that I hope might help.
The sea looks horrid to be blunt. =P It has more texture than the rest of the map put together which is sort of the opposite of how it should be in my mind. The sea should have less texture than the land. You should aim for a flatter blue colour I think.
On the topic of the sea - your river (not sure if it should divide like that at the end either - but anyway) is a completely different colour which makes it look entirely divorced from the ocean it is feeding in to. Also I think that thick black coastal outline isn't appropriate for the style you are aiming for.
I am not sure if you should increase the scale - it depends on how detailed or close up you want your map to be really. This scale is fine I think even though I prefer something more up close for my own maps - but that is also more work which can be uneeded.