Any tips??

[past ginkgo]

im guessing that you have genshin impact so i suggest taking a screenshot of kaveh's side profile in game and then using it as your main reference (especially for the hair). for the face, i suggest using shapes like circles, squares, and triangles to help build the foundation of the head (you can also do the same with the shoulders and neck) this should help the posture look less stiff, however if youd like it to be even more less stiff you could change the expression of kaveh using the eyebrows, eyes, and mouth, you can also use body language to help give mood and emotion to your very nice drawing (for example, making him look up with a sad or solemn expression). if your willing to, a 3/4 perspective helps with a more dynamic pose if you want it to be less stiff (front and back view also work but its kinda harder to pull of and can lead to even more stiffness) but this is optional, side view is perfect too.

for coloring i suggest just colorpicking and using the reference to make sure your coloring will be accurate and will definitely give you an easier time

your drawing looks very nice i especially like how you did the eyes, goodluck 👍

[obsidian fossil]

You have the face way too long and the lower face is too far forward. The jaw needs to have some skin conncting it to the neck. It is never such a sudden change. You also have the start of the bridge of the nose too high up. It should be more down by the bottom of the eyes (Also personally i think the chin is too pointy). as for hair you need to make it more voluminous. Rn it is clinging too much to his skull and back. Genshin with any of their characters they make sure the hair has plenty of volume and even to an incredibly unnatural amount. But this helps make them not look stiff

Also you have they eyes being as if they are front facing. But remember. Eyes are not images that wrap around the skull. They are balls wrapped in skin. So its going to change its appearance depending on the angle. It will look more and more triangular the further to the side the face is turned

[polar cargo]

added a few changes but i dont know how to add emotion to his face