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@Ripton the photos are quite close-up, so it's hard to be sure, but I think the problem may be not that much related to your fingers but rather the global hand/wrist position.

--> Are you supporting the viola with your wrist ? how much ?

--> Are you able to hold the instrument without your left hand at all ? When you are, you get a lot more freedom in finger placement. Then the fingers can fall more or less vertically on the strings (well, not the C string). If not, I think that should be your goal.

--> Do you have an adequate shoulder rest (it helps a lot) ?

Maybe look at the hand/wrist of the player in a few videos and compare with how you're holding your instrument.

Thank you for the photos. Not easy to do that while playing !

So your wrist is not touching the neck below, which is a good thing :-).

Now there's not one single right way to hold the viola, but maybe you could try having the wrist it straighter still ? I mean there's still an angle between your arm and palm:
*argh I don't know how to attach a picture*
*or I just don't yet have enough posts - it still asks me to do stupid things, like put the scissors into the circle…*

Anyway, the reasons I can see for difficult finger placement, apart from gripping the instrument in fear that it should fall off, would be elbow placement. The more the elbow goes forward, under the instrument, the easier it gets to reach the strings from above.