Not bad for first skin ^^
Few things.
Put screenshots in spoilerbox(or box) please. :3
Fix the ranking panel a little, as you can see numbers are out of score box, D:
I think "back" will looks better with capital letter.
Lifebar line shouldn't be shorter?
Add version of your skin (in skin.ini)(some people need it)
If you can, make all scorebar-ki at same height.
And try to correct some edges e.g. on spiner circle.
Work a little more and it will be really good skin. ^^