1.Wrong information in the header.
2.dont use only brushes.
3.Use a better colour for your background .
4.let the sides stand out more then the background.
5.the buttons look amateur .
6.everything looks amateur.
not bad for a first try. but if you do what i said you can make something better.
and btw this dont look like a webdesign . more like a amateur youtube background.
for a beginner. and if you were going for that then . for beginners its handy to use pictures for your background.