I think the mouthpiece / respirator attachment of the helmet could be more present, like in a lighter color or something.

Yeah, I've been wondering if I should do that. I even tried a lighter metal color but it didn't fit ! I should probably try something a bit colorful, if only to add a bit more hue shifts because it could indeed use some presence 

Thanks - I'd like to make the centre black, that would also help the game flow from area to area (Metroid style) but I really struggle to make it blend well in the simplistic style I'm using.

Well as far as I've seen in 2D games, both modern and recents there are multiple options I can remember :
-Make a gradient : The problem with that is that if you go overboard with your gradient (too may tones) it won't look good with the limited palette of pixel art
-Make a border : Make a border just like the actual border you already have for the side around the edges
-Add detail and lessen it : Add just a little bit of texture to the brown, and you can go with less and less detail until the details fade to black, that's hard to actually explain, but it's mostly used for stone anyway

Also, I'd say that a black tile center shouldn't be black but really more greyish (probably dark pale blue).

Maybe some tiling experts will be able to determine which is better for your case

Wow ! Well I do like the general feeling a lot. You have a pretty good basis to be an artist  IMHO. Personally I'd add more texture to the border of the tree, the solid patches of color on its border look a bit out of place. And also maybe add a bit of texture to the inside of the dirt and make it black altogether, depending on how you feel about it. However I do realize how hard texturing dirt correctly is, and can't do it myself at all so that's mostly an advice I couldn't apply myself eheh

while you have improved the body of the genie, (nice job), I think you lost something from your original- a sense of action and dynamism.  Excitement!  Artistry!  A sense of being alive!  This was portrayed better through subtle cues such as the tornado esque smoke of your original, and the embers of the flames rising upwards.  I tried to reintroduce that sense of dynamism.  Don't be afraid to go bold, basically.  There are no limits.  This is an extremely rough and sketchy edit, but i hope it gets the point across.



btw you're 10 years old?? wow, keep up the hard work!  Do you have any knowledge of pixel based theory and techniques such as anti-aliasing and banding?

Woops, sorry, wrong tense, indeed, like said Gil, I was 10 when I started game design As for anti-aliasing I've read about it but I'm not always a fan of anti-aliased pixel arts  However I know I need some work with banding ! Btw thanks for adding back a couple of things I indeed think was lot in the process of re-editing And the purple smoke looks amazing  In the end it gets all your points across I think, don' worry.

Oh and to clear things up, I'm 23. And I started learning art and pixel art theories about 3 years ago and started more serious and intensive training some months ago. I'm working on a doomguy that I'll post later (I'm doing the doomguy cause I think it's an interesting choice for its colors and shapes). Should I post it in a new thread or keep this in a single thread for the moment?