After upper eyelid blepharoplasty, it is very common for there to be swelling in the eyelids. It is even more common for that swelling to be uneven with one eye heavier than the first. In my experience, it is more common for the second eyelid/side to be a little more swollen than the first. For most surgeons, the second side is the left side (traditionally most surgeons are right-handed and start with the right eye). Although a large amount of swelling will have disappeared by 10 days after surgery, the swelling should continue to resolve over the next 10 days and the eyelid heaviness should improve.
If there was no eyelid heaviness before surgery, then most likely there will be no eyelid heaviness after surgery. The exception to this rule is if you had eyelid heaviness before blepharoplasty. By this, I mean actual drooping of the eyelid and not extra skin on top of the eyelid. This eyelid drooping, or ptosis, if not specifically addressed with a ptosis repair procedure, will still be present after surgery.
ONLY 10 days!!!! Swelling can last months as well as the "minor" ptosis.... Best to discuss with your surgeon ASAP...
It is also more swollen and this might account for the difference between the two eyelids. This difference might persist for several weeks or never resolve. If we studies your before photographs and it was clear that you had a slight preexisting upper eyelid ptosis on the left side, we might just be looking at a slight exaggeration of a preexisting condition. In which case, it would be inappropriate for tell you that it will resolve. Generally, slight asymmetries between the two eyelids resolve in weeks to months. Bottom line is that these types of differences in the two eyelids are completely normal, they do not always full resolve especially if there was a preexisting asymmetry and this difference in no way suggests that something is wrong or that your surgeon "did something wrong." Generally it is tincture of time that is need to make this type of situation better.
It can last as long as there is still swelling. Sometimes external trauma to the eyelid can cause post injury ptosis of the eyelid that can take up to 6 months to resolve. I would suggest doing warm compresses at this point until seeing your surgeon back. It usually will resolve on its own.
I suspect that this is postoperative swelling and should resolve in one to three weeks.
From your photos, I suspect that you will get a good result.