He's looking clean and well done to me. The kind of work it can take some people years to put together. Feel good about your skills.
To critique the skin, while looking well blended, it's looking like the majority of the tonal range is in the middle, with very little darkness or brightness. A mite more contrast could make him pop more.
It's something I've found myself succumbing to. As I progress through the highlighting stages I leave too little an area before it untouched, it ends up wholly less dark than it was in my minds eye. Can often remedy that by reworking the area with some thinned inks to glaze-tint the areas we'd want a mite darker. Not applied as a wash, but controlled, just a modicum of paint of paint on the brush and applied just where we'd want it.
Slayers red hair is dyed, so whatever process you choose to paint it is gonna be appropriate. I go with whatever orange I whimsically like the look of that day, and shade it with a mix of flesh, red and brown ink. Getting it darker where the hair meets the head.
Hair is a rare good opportunity to dry-brush highlights on, but more so than even normally I'd be subtle with that technique on a slayers hair. They stick it up with pig fat, and drybrushing can all too easily make something look dry and dusty instead of appropriately slick. I tend to highlight slayers hair with the side of the brush brought up against the sides of the mohawks, letting the brush pick out the raised strands with the highlights, it's cleaner and less dusty that way. Would still finish off with a proper drybrush on the top of the mohawk though, a proper light one, and that paint coul be used to pick out the occasional prominent strand of hair down the side too.
The order of which area to paint, that's ain't something set in stone. Some people start with the face to set the tone of the mini and work out from there. Some work from the feet up. Some do metals first. It's not a bad idea to leave the areas most "outside" to later on (like the top of the hair, fingers etc), as they could be touched during painting and the paint rubbed away.
Honestly though, that's looking far too good for a first mini. Years on, you shan't get to enjoy the painful wince when someone brings out one of your early miniatures. You might want to give yourself a handicap, try finishing it off with your feet.
