It's still a nice picture as it stands, but for small objects close to the camera the flash could be a little bright, but the exposure time can be a too long without.
I would suggest starting with:
Putting the camera on Manual (M)
Setting the speed to 1/100 sec (using the wheel but the shutter release)
Setting the ISO to 100
Having the aperture as wide open as possible (hold the Av +/- button while using the wheel by the shutter release).
(I would also try using the RAW format).
If this is too bright - by checking the histogram (it probably will be) (I think the display will also flash the areas which are over-exposed on the image) then decrease the aperture until it is OK.
EDIT: You can also decrease the effective brightness of the flash by moving the camera further away and using the longer end of the zoom ...