little bit tricky to see any detail as the photo is not clear enough really.
though from what is visible it seems like a perfectly good outcome.seems smooth and regular though perhaps the tip on the thumb is a little longer than the rest.

if there were any glaring mistakes i think it would be visible even on a low quality shot.

to be honest ive never been a fan of the nsi colours, i always found them to be a bit on the murky side. i prefer things to be more intense. though of course thats just my personal opinion as i know others find them satisfactory.
my advice in the nail art side would be to use a slightly finer brush as i think it would give a more professional artistic finish to your design. if you cant find a brush thats thin enough, trim away some of the hairs at the base so that you have fewer.

i hope ive helped in a small way.

I'm sure if you look in the tutorial section there is one for resizing pics hth