How many calories would you say this is?

I would log each component of this meal separately - weigh the chicken, find an entry for cooked chicken with a per-gram or per-100g unit option. This looks like Chinese food, so that chicken was probably fried. Log ~2-4 tbsp teriyaki sauce (err on the side of overestimating). Find an entry for commercial frozen gyoza - hopefully that will have a grams-based unit but if it's per each (i.e. serving size "6 gyoza" vs "85 grams" or whatever), log that as best you can. Weigh the rice as well, find an entry for cooked white rice.

its morning now, but for future reference.... that rice you could separate out and weigh and find a cooked white rice entry. its probably a cup or two (hard to see that far pile). I'd weigh it (i dont eat rice often)

the gyoza- find a fried chicken gyoza entry. it will be an estimate but close enough

the teriyaki.... most often made with thigh meat (my ex was a japanese chef). id weigh the chicken. estimate the sauce. find a high calorie one and estimate high- quarter cup maybe. likely not to be that much but the chicken would have been pan fried in oil before the sauce was applied.

Just an FYI, your scale will likely jump up the next couple of days due to the sodium (water) uptick. itll go back down.

All you can do is estimate it. I'd pick an entry that is a restaurant entry and use that. Many of the entries for an entre are going to be some other users recipe...I'd use a entry from a restaurant chain as portions and ingredients, oils, etc will likely be more similar than a homemade entry.