The first thing that comes to notice is your Adsense in top right side. Any experienced user will get away from those in a snap. Try to blend them with your colors.
As for buttons/smilies/icons try any of
Shelley's graphic packs. What's best of them is that he/she provides them in white/black matted options.
Here is another good button set.
https://vborg.vbsupport.ru/showthread.php?t=156773
Enjoy your board.
Regards,
Val.