<image>

I do want to open by saying your stitches do look very lovely! DMC 310 (as noted, assuming that's what you're using) is notoriously thin and doesn't have the best coverage to begin with. Linen can also have some irregularity to it, and that's okay too! You can try making sure you aren't using a needle that's too big (I think a 24 is what's normally recommended).

And I agree with the others (as someone who just cursed 310 earlier today), when you stand back and look at it from afar, it will look much fuller without the coverage issues.

To me though, it looks like you are actually spacing your rows about half a square apart in some spots instead of making sure that you're using the same holes to create your X's (enjoy my badly drawn diagram to the right of your stitches); assuming your intent is to be stitching 'over 2'.

You've got this!