i cannot
Just practice getting used to how the map looks in his smokes form, then learn the good smokes spots on the maps ur playing him on, then learn some one ways.
After you get his smokes down practice using his blind so that you don't blind ur team.
The tp's are a little harder to figure out hard to use effectively, but an easy use is just to tp out of a bad situation or across a choke point/line of vision.
His ult is not that useful but it can be used to grab spike, rotate fast, or get information. You can also try to use it to flank, but it's risky to do that.
Boom, after all that you have Omen down somewhat. Tbh Omen really isn't that hard once you get used to the map in is smoke form.