Hello, I just recieved an order, the order is about rewriting a book, and I just realised that the work is way too much to do and the price I had kept of my package was way too less, I am feeling very demotivated and sad about it, so I was thinking that after finishing 50% of the work and showing it to the client/buyer I can offer an extra saying that it's not compulsory for them to buy this extra but to appreciate my efforts please buy this extra (just as a Tip), will this ruin my impression and is a bad idea or is it fine, I won't force the buyer, will just ask as a favour, I know there is a Tip feature too in Fiverr but still it's very unlikely that they may choose it voluntarily, or should I just ask them to tip me? I feel that they might not tip me after completion of the order but might still buy the extra, in the risk of that might be I won't do the 50% remaining work properly. And anyway I am not forcing the client, so should I offer extra just as a Tip?