It's okay... Good, considering everything there is custom... However, there are some stuff I think I should point at, but really can't tell how to correct since I'm quite far from being an expert on graphics...
1. The letters and gradients on "Items" and "Map" look like menus from crappy soccer games from the SNES...
2. The Items and Map + Symbol, doesn't really looks well... It's not very "+" shaped and the arrows inside it could be better...
3. The details on the rock walls are so exaggerated... it's hard to compare it to the water... looking at the exaggerated details on the walls, makes me think that water is ice...
4. According to
this funny moment from VGcats, reality is brown, everything real is brown, look at all those "AMAGAD! GRAPHECS!" games on X360 and PS3: no brown - no real. However, that just applies to 3d games...
On 2d, it's another thing... 2D games are meant to be a nice-looking festival of colors (look at Golden Sun, Sword of Mana, Final Fantasy Tactics Advance, Minish Cap and much more...), nor was Twilight Princess that much brown.