Hi! I can see you struggling to get those thin green lines on the red robes... ^^'
You can work thin lines in a lot of ways, but applying thick paint won't work, it may look that you go faster because you are covering the red with one or two layers, but it should be a lot better if you thin your paint a lot more to do so, because with a thinner paint you'll have a better flow on the brush ans so you wil "draw" a lot better with it.
You can also want to try to do the lines in white then cover them in green, that way your green will become more bright.
I also see thickness problems on the gems! Better 4 thin layers than 1!! Yes it is more work but it will give you a much nicer finish. ;)
This is a much better pic though still a bit burned out (too much light) You can try with a darker background at the same position and see if it helps (this should be easier than finetuning your camera)