Firstly may I say please please do not think that I am being overly critial , especialy of you in person , ....let me explain ,....
this happened in our temple , people bring items used for home worship to the temple if they could not look after them for some reason , they would donate them hoping someone would look after them .
many Hindus are reluctant to take another persons Deities , there are many reasons for this , a person forms a relationship with the Deity so taking another persons deity can be seen as taking on some of the karmic conections associated with that person and his / her Deity , ...for this reason most Hindu will want a new un worshiped Deity , ...
however that being said I have mostly all old Deities , ...I canot help but stop my self adopting them , ...but they do often have different character and feel because of their different worship (or not) over the years , ....
it is important also that we understand that deity like this is a cheap representation for worship at home or as almost a souvenier , these Resin deities in my mind are not good to worship , realy it is better to treat this as an ornament than a Deity , just a representation , ...in some respect it will be good for you to practice as these deities allready exist and of course it will be good for them to be loved and cared for as not even a picture of Radha Krsna should remain un loved , ....but there is also a problem , these kind of deities are not vey correct , so all we can do is try to treat them as sympatheticaly as possible , ....these should be painted up like the marble Deities as there are different methods for painting marble which looks more lifelike , and Panchadhatu which has different Qualities
here with Panchadhatu Deities we paint only certain portions and there is correct procedure that must be followed , we paint only the fearures , the palms of the hands and soles of the feet , ..and the under clothing , there are only certain instances when the colour of the Deity is changed .
marble Deities are painted similarly except the features can be more lifelike , ...but it is normal in most cases to let mnatural colour of the marble shine through
to repaint resin deitys with clothing all cast in one you could study the small marble deities from shops like this
http://www.gmb.ooo/radha-krishna-statues/radha-krishna-murti-294-381.aspx here you will see both Radha and Krsna wear crowns not helmets , ...and difference between jewellery and garlands is more clearly defined , ....
but please please do not complain or make jokes about the Kumkum this was someones devotion , allthough this is not normal for Radha Krsna deities , well at least not in our tradition , it is very commonly practiced amongst some Hindu , ...so when removing it do so very respectfully .
when we take on another persons Deity it is usual that we think that we are continuing the service that another has given , even if we do not agree with anothers form of worship we canot just impose our will on the deity , if we want to do another way we must first ask permition of the Deity , ......and we must be willing to meditate on understanding what the Deity itself wants , .....
I know it is only a common figure of speach , and I am sure you did not intend to offend , ..but you canot '' jazz up a deity '' ....it is not a '' victim '' , it is not a '' patient '' , .....if you wish to repaint the deitys however small or cheaply manifactured they are , you become their servant , you must do as they wish .
sorry if I sound exacting but it is better we know correct procedure and what is involved in this Seva , ...westernisation and comercialisation of hinduism is now inventing its own rules this will in the end be detremental to true Hinduism which although it needs to adapt to suit the needs of the times and of devotional attitudes , there are somethings that canot and should not be changed as they are laid down in Shastra , ...similarly any thing associated with Deity Seva and Worship should be taken very seriously , ....for this we need the instruction of the Guru or trained Pujari , ....
we must even be wary of Murti Wala's as comercialisation often creaps in , in this instance important aspects of tradition are lost .