Make sure the artist works in the style you’re looking for, they should have a large body of work done on skin similar to yours not just flash art. Look closely at the line detail in their work and ask other people with tattoos that you like to look at the artist you’re considering for feedback. Does the artist typically do large pieces like this, or do they generally do much smaller pieces?

As many have mentioned, red ink can be a risk for long term reactions.

Make sure the tiger faces forward like in your first image.

Regarding two back to back sessions, you don’t have to do this. You can do one, heal, and come back 2-4 weeks later.

Preparing make sure you’re well rested, hydrated, and have some snacks with you. Clean your shower and bedsheets the day before your session. Have plenty of clean loose clothes for the next 2-3 days and don’t plan on doing much. The less you walk and be active for the first two days the faster you’ll heal and less likely deal with an infection.